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      • the vertebral column
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    • dissection of the fetal pig
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    • In-Vitro Fertilization
    • Infertility
    • Genetics of Reproduction
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    • The Pregnant Body
    • fetal development
    • Development of the Nervous System
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    • Postpartum Issues
    • Twins
  • Chemistry
    • pH Lab
    • The Chemistry of Cells - ORGANIC
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    • Volcano Project
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    • Time Management
  • Environmental Science
    • MIDTERM 2 STUDY GUIDE
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    • ENVS 105 Home Page
      • Midterm 3 Study Guide Population Ecology
      • Ecology II - Communities and Ecosystems
      • Module 1 Assignments
      • Module 2 Assignments
    • Inrtoduction to ENV SCI
    • Historical Perspective of ​Environmental Science
    • Biomes
    • FOOD CHAIN and FOOD WEB
    • Biogeochemical Recycling
    • Evolution - Our Beginning
    • Genetic Inheritance
    • Evolution: How Populations Change over Time
    • Symbiosis
    • Population Ecology
    • Competition in Nature
    • Herbivory
    • Niches
    • Fossil Fuels
  • Environmental Biology Laboratory
    • SOILS AND GROUNDWATER
    • Ecological Roles of Living Organisms
      • The Basics
      • Bacteria - Ecological Roles
      • Protists - Ecological Roles
      • Fungus - Ecological Roles
      • Plantae and Animalia - Ecological Roles
    • Virtual FIELD TRIP TO THE RIO HONDO COLLEGE ​WILDLIFE SANCTUARY - Adaptations to Dry Climates
    • Microscopic Plant Adaptations
    • Natural Selection
    • GROWTH CURVES
    • SOILS AND GROUNDWATER
    • LC50 and LD50
    • How to Make a Solar Water Heater
    • WATER QUALITY ANALYSIS
  • General Biology
    • Characteristics of Life
    • Chemistry of Life - Inorganic
    • The Chemistry of Cells - ORGANIC
    • Introduction to The Cell
    • Photosynthesis and cellular Respiration
    • Cell Membranes and Osmosis
    • The Cell Cycle
    • REGULATION of The Cell Cycle
    • Mitosis
    • Meiosis
    • The Structure of DNA
    • Evolution
  • General Biology Laboratory
    • GENERAL BIOLOGY 101 LABORATORY HOME PAGE
      • Enzymes
      • OSMOSIS LAB
      • Lab 1 - Bacteria, Protista and Fungi
      • Lab 2 - Plantae and Animalia
      • Photosynthesis
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      • Lab 7 - Membrane Transport
      • Lab 8 - Enzymes
      • Lab 9 - Photosynthesis
      • Lab 10 Fermentation, Aerobic Cellular Respiration and Associated Major Organ Systems
    • GENERAL BIO 1110L Labs
      • lab 2 - CELLS - BIO 111L
      • lab 3 - DIFFUSION and OSMOSIS - BIO 111L
      • lab 4 - The Circulatory System - BIO 111L
      • lab 6 - Photosynthesis and Cellular Respiration
      • lab 7 - Reproduction - BIO 111L
      • DNA, GENES AND GENETIC INHERITANCE
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      • lab 10 - ADAPTATIONS - BIO 111L
      • lab 11 - ECOSYSTEMS AND BIODIVERSITY
  • Human Biology
    • A History of Human Biology
    • Levels of Organization
    • The Chemistry of Cells - ORGANIC
    • Cells
    • Cartilage SAC
    • BONES AND SKELETAL TISSUES
  • Human Biology Lab
    • Testing for Sugar, Starch and Proteins
    • Osmosis, Diffusion and Filtration
    • buffers
    • OSMOSIS LAB
    • Anatomical Planes
    • Body Cavities and Membranes
    • Anatomical Positions
    • The Appendicular Skeleton
    • The SKULL
    • the Thoracic Cage
    • the vertebral column
  • Human Sexuality
    • Course Information
    • Course Calendar
    • Lesson 1 - Introduction to Human Sexuality
    • Lesson 2 - Genetic Inheritance of Human Sexuality
    • Lesson 3 - The Male Reproductive Tract
    • Lesson 4 - The Female Reproductive Tract
    • Lesson 5 - The Menstrual Cycle
    • Midterm Exam Study Guide
    • Lesson 6 - Fetal Development and Sexual Differentiation
    • Lesson 7 - Disorders of Sexual Development
    • Lesson 8 - Gender Identity and Sexual Attraction
    • Lesson 9 - Fetishism
    • Lesson 10 - Sexuality Throughout the World
    • ​Lesson 11 - Sexuality Through the Ages
    • Lesson 12 - Sexual Harassment, Coercion and Violence
    • Final Exam Study Guide
  • Microbiology PORTAL
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      • ​Intro to Microorganisms
      • Diseases
      • EPIDEMIOLOGY
      • HOST DEFENSES
      • PATHOGENICITY
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      • Bacteria versus Archaea
      • Intro. to Bacteria
      • Viruses and Prions
      • Microbial Genetics
      • Microbial Nutrition and Growth
        • Nutritional Categories
        • Microbial Metabolism
        • CONTROL OF BACTERIA GROWTH AND ANTIBIOTICS
      • Eukaryotic Organisms
      • Archaeal Diversity
      • Prokaryotic and Eukaryotic Cells
      • Bacteria vs Archaeal Structures
      • Taxonomic Classifications
      • Archaea, Bacteria and Eukaryotic Cells
      • MIC- CPP Course Calendar
    • Cell Theory
    • Chemistry of Life
      • Chemical Bonds
      • Chemical Reactions
    • Biofilms
    • Definition of Terms
  • Microbiology Laboratory
    • Cell Culture and Inoculations
    • aseptic technique
    • WET MOUNT
    • Streak Plate
    • Mannitol salt agar (MSA) Test
    • Eosin Methylene Blue (EMB)
    • Blood Agar
    • Dilution Series and Calculations
    • Phage Plaque Assay
    • MICROBIOLOGY UNKNOWN LAB
    • Microbiology Lab -study guide exam one
    • Ex 2 - Microorganisms
    • EX 3 - aseptic technique
    • Ex 4 - Smear Prep
    • Ex 5 - Simple Stains
    • Ex 6 - Negative Staining
    • Ex 8 - Gram Stain
    • Ex 9 - Acid-Fast Stain
    • Ex 10 - Endospore Stain
    • Ex 11 - Motility Test
    • ex 12 -​ Pure culture technique
    • ex 13 - UV Radiation
    • Ex 14 - Enumeration of Bacteria : Standard Plate Count
    • ex - 15 Effects of Temperature on Growth
    • ex 16 - Hand-washing
    • ex 17 - pH and microbial growth
    • ex 18 - Evaluation of Antiseptics
    • ex 19 - Antibiotic Sensitivity : Kirby-Bauer Method
  • HISTOTECHNOLOGY
  • The Brain
  • The Brain
  • The Structure of DNA
  • Contact
  • FUN ZONE
    • GAMES
    • Video Vault
    • Population Ecology - ACTIVITY
    • The Carbon Cycle - ACTIVITY
    • Evolution - ACTIVITY
    • The Cell Game
    • SYMBIOSIS ACTIVITY
    • THE LORAX ACTIVITY
    • Brittney the Kidney
    • From Soup to Poop
    • MITOSIS - THE NURSERY RHYME
    • Verne the Sperm and friends
      • Verne the Sperm pg1
        • Verne the Sperm pg2
        • Verne the Sperm pg3
        • Verne the Sperm pg4
        • Verne the Sperm pg5
  • Lab 6 - The Chemistry of Cells
  • A History of Anatomy
  • List of Pages
    • Microscopes
  • Cell Membranes and Osmosis
  • Chemistry of Life
  • Muscle Movements
  • The Muscles of the Head, Trunk and Shoulders
  • The Muscles of the Limbs
  • Nervous Tissue
  • The Brain - Anat and Physiology
  • Instructions for Taking BIO 3070
  • MTH 121 Algebra A - Course Schedule and Info
  • Laboratory Calendar CMC Spring 2019
  • Genetics Lab
  • Chemistry and Conversions Lab
  • Digestion and Enzymes Lab
  • Endocrine and Homeostasis Lab
  • Muscles and Reflexes Lab
  • Sensory Lab
  • Immunohistochemistry
  • Blood Lab
  • Heart Rate, Blood Pressure, Electrocardiogram Lab
  • Respiratory Lab
  • Lab 11 Renal Lab
  • Blood Typing Game
  • Body Systems Interactive
  • Ch 9 - The Central Nervous System
  • Ch 10 - Sensory Systems
  • Neuron Virtual Laboratory
  • Virtual Eye Lab
  • Virtual pH Lab
  • Chemical Bonds Virtual Lab
  • Beer's Law Virtual Lab
  • Build-an-Atom Virtual Lab
  • Diffusion Virtual Lab
  • Ohm's Law Virtual Lab
  • New Page
  • Ch 8 - Nervous System

CONNECTIVE TISSUE

Picture

Practice Identifying Your Tissue With This Slide Show!
Then try the quiz at the bottom of this page!

The 4 Types of Connective Tissues

 Connective tissues include a wide variety of tissue types with a wide variety of functions, only one of those functions is to connect tissues and organs together. For example, your bones and your cartilage are connective tissues that function as the structural support of the body. Fat tissue and blood are connective tissues that function to store and carry nutrients. Connective tissue proper acts to surround delicate vessels and nerves and contains specialized cells that fight infection. ​
The four broad categories of connective tissue are classified according to the characteristics of their ground substance and the types of fibers found within the matrix.

The 4 Types of Connective Tissues Include:
​
1) Connective Tissue Proper
2) Cartilage
3) Bone
4) Blood

Connective Tissue Proper

Picture

Cartilage

Picture

Bone

Picture

Blood

Picture
​There are 3 characteristics that are shared by all of the different types of connective tissue. 
  1. All connective tissue contains relatively few cells with large space between them.
  2. All connective tissue contains a large amount of extracellular matrix (ground substances and protein fibers).​
  3. All connective tissues have the same embryonic origin; the mesenchyme (comes from mesoderm germ layer of embryo). 
  4. Special cell that secrete extracellular matrix proteins
    •fibroblasts for areolar tissue and reticular C.T.,
    •adipocytes for adipose
    •chondroblasts for cartilage
    •osteoblasts for bone
    •hematopoietic stem cell for blood

Connective Tissue
- The Matrix is REAL - 

via GIPHY

 Yes, the matrix is real... and it's in your connective tissue!

     Yes, the matrix is real! Connective tissues are composed of not only of specific cell types, but also the protein fibers and ground substance that make up the surrounding extracellular matrix. Connective tissue cells are interspersed within the unique extracellular matrix of the tissue. The composition and density  of proteins and molecules that make up the matrix varies with the different types of connective tissues. It is the specific composition of the cells, ground substance and the protein fibers that make up the connective tissue that gives it the ability to provide its specific function within the body. This is the complementarity between structure and function in connective tissues.
What is the "Ground Substance"? The ground substance refers to the substance that surrounds the cells and fibers of the extracellular matrix. The ground substance is a thick or jelly-like substance in connective tissues, except for in bone and cartilage in which the ground substance is calcified.

What are the "Protein Fibers"?  The matrix has a scaffolding made up of fibrous proteins. that provide support for the connective tissue. There are 3 types of protein fibers that can be found in connective tissues: 1) collagen fibers, 2) reticular fibers, and 3) elastic fibers. The types, density, and distribution of the protein fibers is unique in different connective tissue types.
 
Picture
The matrix of connective tissues is made up of three types of fibers. The  amounts and density of collagen fibers, reticular fibers, and elastic fibers.

Collagen fibers are the strongest, most visible (under the microscope) and most abundant type of fiber in connective tissues. They are bundles of fibers that are cross-linked to each other. They are resistant to being stretched and they add strength to the connective tissue. 

Reticular fibers are thin collagen fibrils that form a scaffolding network of fibers. The word reticulum means "network". Reticular fibers allow a lot more flexibility in being moved or stretched due to the lack of cross-links that would hinder their movement.

Elastic fibers contain the  protein elastin, which allows for a great deal of stretching, while being able to return to its original non-stretched position. 
IMAGE Courtesy of BOUNDLESS  
figures.boundless-cdn.com/19479/full/figure-33-02-06.jpeg

The Common Origin of Connective Tissue

 It may be hard to believe that these very different tissue types are related, but it is true! 
Picture
   The cells that make up the different connective tissue types all have the same embryonic origin.

    During the early stages of development, the embryo form 3 distinct layers; the ectoderm (outer layer),
the mesoderm (middle layer, and  endoderm (inner layer) and ).

    The cells of the mesoderm have  ​mesenchymal stem cells that can differentiate into many different cell types. 
   

The Origin of Connective Tissue Cell Types: The mesenchymal stem cells give rise to the different cell types needed to form  all of the different connective tissue types. Mesenchymal stem cells give rise to the osteoblasts which form your bones, the chondrocytes that form your cartilage, the fibrocytes that form your connective tissue proper, and the adipocytes that form your adipose (fat) cells. 
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The origin of blood cells - Blood cells are also considered connective tissue, but they are derived from hematopoietic stem cells that are made in your bone marrow which was derived from mesenchymal stem cells. Hematopoietic stem cells give rise to the various types of white blood cells, red blood cells and platelets. 
Defense cells of the connective tissue proper. The blood usually takes all of the glory when people think of the cells that fight infection, but you have many types of immune cells that are at work in your connective tissue proper screening and destroying invaders. Your immune cells include phagocytes (neutrophils, monocytes, and macrophages), inflammatory mediators (basophils, mast cells, and eosinophils), and natural killer cells (NK cells).​

Connective Tissue Proper

     The first category of connective tissue we will explore is called the connective tissue proper. The main function of connective tissue proper is to bind tissues, and to resist stress and taring due to stretching and tension placed on the tissue. Connective tissue proper, found in most organs, is characterized by a predominance of fibers (mainly type I collagen) in the extracellular matrix. Its varied functions are chiefly related to binding cells and tissues into organs and organ systems. Its sub-classes are based on the type, density, and orientation of its fibers.
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​The primary cell type in connective tissue proper  is the fibroblast.

The fibroblast produces components for the extracellular matrix of the connective tissue proper, which includes collagen and elastin.  The fibroblast means “fiber formers”, and they live up to their name. Fibroblasts manufacture proteins and secrete them (via exocytosis) into the extracellular matrix where they act as building blocks for the matrix. 



Connective tissue proper includes a few other cell types in addition to its primary cell type, the fibroblast. These additional cells include fibrocytes, defense cells, and adipose (fat) cells. The ground substance in connective tissue proper is the consistency of jelly and is composed of collagen and elastin. 

What Tissue Types Are Considered "Connective Tissue Proper"?

  Connective tissue proper contains tissues that fall into 2 different categories.
1) L
oose Connective Tissues
2)
 Dense Connective Tissues
  

  There are 3 types of Loose Connective Tissue.
1) Areolar Connective Tissue
2) Adipose (Fat) Tissue
3) Reticular Tissue

  There are 3 types of Dense Connective Tissue.
1) Dense Regular Connective Tissue
2) Dense Irregular Connective Tissue
3) Elastic Connective Tissue


Areolar Connective Tissue  
A Type of Loose Connective Tissue

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Here is an illustration of areolar connective tissue. Areloar connective tissue is very 'loose'. Areolar tissue is composed of a lot of matrix and relatively few cells. The primary cell of areolar connective tissue is the flibroblast. The fibroblast function in the areloar tissue to form the fibers of the matrix and the surrounding ground substance.  

Areolar connective tissue is a loose connective tissue.The appearance of areolar connective tissue makes me think of "paint brush strokes".

​     Areolar tissue appears as a disorganized network of fibers with lots of space between them and a small number of spread out cells. The ground substance of the areolar tissue is a viscous liquid that surrounds the cells and fibers. Areolar tissue is strong, yet flexible and elastic and resists taring. This tissue surrounds blood vessels and nerves, is found in and around most of your organs,  and is an important component for your skin where it acts to support the epithelia, and to anchor your skin to underlying muscle tissues.  

​    ​     The areolar tissue surrounds the organs provides flexible structure and support. The areolar tissue allows a high degree of movement between adjacent body parts.
 
 
The key functions of areolar tissue can be summarized as providing:
  • Support
  • Strength
  • Elasticity
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Areolar Connective Tissue Slide

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Areolar Connective Tissue Slide
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Areolar Connective Tissue Slide

Adipose Connective Tissue  
A Type of Loose Connective Tissue 

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Adipose (fat) tissue function to store energy and produce heat. 
​

Adipose (fat) cells, is considered a loose connective tissue of the connective tissue proper. There are actually two different types of fat tissue; white fat and brown fat. Your white fat stores energy (in the form of a lipid droplet, while brown fat functions to generate body heat. Infants have a lot more brown fat than adults do. This is one of the reasons that infants have a higher normal temperature than adults. 

Adipose Connective Tissue Slides                                 Know THIS Slide for the Practical!
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​Under the microscope, adipose cells (adipocytes) appear as large ovals with the nucleus off to one side. This odd appearance is due to the presence of a large lipid (fat) droplet that flattens the nucleus and  pushes the cytoplasm to one end of the cell. The lipid droplet that takes of most of the area within these cells is hydrophobic, so it does not take up any of the applied stain. So, a slide containing adipose cells is going to appear as mostly "white space". However, it is important to locate the cell membrane and the nuclei to ensure that the slide is of adipose cells and not just out of focus. 

Visceral Fat vs. Subcutaneous Fat
   Visceral fat is different from subcutaneous fat underneath the skin, and intramuscular fat interspersed in skeletal muscles.  You may have heard that people who have a large accumulation of adipose tissue in the abdomen region are at a higher risk diabetes, heart disease, cancer and stroke.  This is true, but why?

    "Belly fat" is an indicator of "visceral fat". Visceral fat surrounds these visceral organs and can effect their function. Remember that your visceral organs include all of the organs contained within your ventral cavity. Men are more likely to have their excess adipose tissue stored in the abdomen due to male sex hormones. Women, on the other hand, tend to carry their excess adipose tissue on the buttocks, thighs, and hips in women due to female sex hormones. When women reach menopause, the decrease in estrogen production by the ovaries induces a change in the location of fat store from the thighs, hips and buttocks to the abdomen where it is more detrimental to health.

   Subcutaneous fat is found just below the skin in a region called the hypodermis and is not related to the obesity-related diseases, cancer and stroke. 

Reticuluar Connective Tissue  
A Type of Loose Connective Tissue 

Reticular Connective Tissue. 

 
​ Reticular connective tissue
 is a type of loose connective tissue that contains a network of reticular fibers. The word "recticulum" means (net or network). Reticular fibers are very noticeable in these tissues. These reticular fibers are synthesized by fibroblasts (also called reticular cells). 

   Reticular connective tissue is found in bone marrow and surrounding the kidneys, the spleen, and the lymph nodes. ​Reticular connective tissue forms a flexible 'skeleton' or internal framework, that can support many free blood cells (largely lymphocytes) in lymph nodes, the spleen, and red bone marrow.
​
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Slides of reticular connective tissue. 
​
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​There are 3 types of Dense Connective Tissue: 

Dense Regular Connective Tissue -  has a rope-like arrangement of fiber bundles
Dense Irregular connective tissue - has a wavy, woven fabric-like arrangement
Elastic Connective Tissue - has stacked swiggly wavy lines 

Dense Regular Connective Tissue  
A Type of  
​Dense Connective Tissue

Dense regular connective tissue 

​     The fibers of this tissue are tightly packed into par­allel bundles, between which are a few highly attenuated, spindle-shaped fibroblasts. The small, cigar-shaped nuclei of the fibroblasts are oriented parallel to the fibers; the cytoplasm is difficult to distinguish with the light microscope. There is little room for the ground substance, which nevertheless permeates the tissue. 
​
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Slide of tendon

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Dense regular connective tissue is packed with collagen fibers. This makes them very strong and resistant to stretch. This unique property allows them to transit mechanical force over long distances using a minimum of material and space, while resisting mechanical forces from other directions. This tissue therefore serves to transmit the force of muscle contraction, to attach bones to one another, and to protect other tissues and organs. 
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Dense regular connective tissue is found in tendons, ligaments, periosteum, perichondrium, deep fascia, and some organ capsules. ​You are already familiar with these tissues, even if you don't already know it. In some cuts of meat, you can see these tissues as the white stringy substance that has a harder consistency.  In anatomy, a ligament is the dense regular connective tissue that connects bones to other bones.  and a tendon  is the dense regular connective tissue that connects bones to muscle (for example, the hamstring.)


Dense Irregular Connective Tissue

- WE DO NOT HAVE DENSE IRREGULAR TISSUE SLIDE FOR PRACTICAL - 
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Dense irregular connective tissue consists of tightly packer collagen fibers that appear less organized and less uniform that dense regular connective tissue tissue. The nuclei in this tissue are stretch long and the tissue may appear wavy under a microscope. The major cell on dense irregular connective tissue is the fibroblasts. 
   Dense irregular connective tissue is able to withstand tension from multiple directions. It provides support and strength. This tissue is found in areas that experience stretching from multiple angles, such as the dermis of the skin, the submucosa of the digestive tract and the fibrous capsules of organs and joints. 


Elastic Connective Tissue
A Type of Dense Connective Tissue

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Elastic fibers are present in different concentrations in all of the connective tissues proper. Elastic fibers are made with elastin that has the ability to stretch and then return to its original shape after being stretched. Connective tissues that have a very large amount of elastin are referred to as elastic connective tissue.

     Elastic connective tissues are present in relatively high concentration in several organs, including the largest arteries in the body. 

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Fibroblasts or fibrocytes  are the primary cell in elastic connective tissue. The fibroblast cells make he elastin necessary for the elastic fibers and also provide other proteins and molecules that contribute to the matrix. 

Cartilage 

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WHAT IS CARTILAGE?


 Cartilage is a supportive connective tissue that functions in the body to provide structural support, protection of soft tissues and increases strength. You are born with a lot more cartilage than you have as an adult. As you grow, much of this cartilage is used to guide the growth of bones. For example, the human skull is composed of separated bones at birth and then fuses during development to form the skull. Once the bones have fused, the cartilage is broken down by the body and not replaced.  This is why infants are born with a "soft spot" at the top of their head that disappears.

     Cartilage tissue consists of a dense collection of collagen and elastin fibers. The primary cell in cartilage are chondrocytes. The fibers and the ground substance  that makes up the matrix of cartilage is made from chrondroblasts (instead of fibroblasts as seen in connective tissue proper) which are immature chondrocytes.

  Cartilage is usually closely associated with a dense irregular connective tissue (called perichondrium). This configuration is very important for the cartilage. Cartilage does not have blood or lymph vessels and does not have nerves (in not innervated) . The cartilage gets is nutrients from dense irregular tissue of the perichondrium via 
diffusion through the matrix. Whenever there is an injury that occurs in an area that contains a lot of cartilage (like the Achilles heel ) the amount of time necessary for healing is greatly increased. The fact that cartilage has no nerves, means that cartilage is not sensitive to pain or pressure, 

    Cartilage is closely related to bone. Whenever cartilage gets calcified, the chondrocytes of the cartilage die and the cartilage will be replaced by bone tissue. Cartilage has more flexibility than bone, due to a flexible material called  chondroitin which exists in the matrix. chondroitin is sometimes taken as a supplement for joint pain. .


There are 3 types of cartilage.

1) 
 Hyaline Cartilage
2)  F
ibrocartilage 
3)  E
lastic Cartilage
. 

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Hyaline Cartilage

     Hyaline cartilage is the most abundant type of cartilage found in our body. Your entire skeleton actually started out as hyaline cartilage when you were developing in the womb. As an adult, you have hyaline cartilage covering the surfaces of  your bones at each of your joints. Your ribs also contain hyaline cartilage at the anterior ends. You have hyaline cartilage in your bronchi, your bronchial tubes, nose and trachea.  You even have hyaline cartilage that forms your vocal cords!
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via GIPHY

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​Hyaline cartilage tissue appears as a shiny bluish-white, material that contains collagen fibrils and chondrocytes. Hyaline Cartilage functions is the body to allow for the gliding motion  of adjacent structure by providing a smooth surface. It also provides flexible support. Hyaline cartilage also acts to connect the ribs to the sternum (the costal region).
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    Hyaline cartilage means "glass. It gets its name from its clear glass-like appearance when observed with the naked eye (this quality is not visible on stained slides).  When viewed under the light microscope, hyaline cartilage has clearly defined  cells (the chondrocytes) that seem round.  The cells are surrounded by a blank spaces called lacunae. In histology, a lacuna is a small space containing an osteocyte in bone or chondrocyte in cartilage.The fiber portion of the matrix of hyaline cartilage contains  only thin fibrils of collagen that are too thin to be seen with a light microscope. The ground substance has a jelly-like consistency and  holds large amounts of water. The structural properties of hyaline cartilage given it the ability to resists compression  and provide strength and flexibility. 

Fibrocartilage (Fibrous Cartilage)

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      Fibrocartilage is a tough form of cartilage that consists of chondrocytes scattered among clearly visible dense bundles of collagen fibers within the matrix. Fibrocartilage is found in portions of your joints, your intevertebral discs, your knee (as the meniscus) and your pubic symphysis which joins the anterior portions of your hip bones together Fibrocartilage provides structure and support. It is also the strongest type of cartilage. 
      Fibrocartilage has the ability to resist strong compression and strong tension (pushing and pulling) forces. The areas of the body that have this type of cartilage are subjected to a lot of push and pull (compression and tension) forces. its consistency lies somewhere between hyaline cartilage and dense regular connective tissue. Fibrocartilage has thick collagen fibers which makes it somewhat similar to dense regular connective tissue, however the cartilage includes chondrocytes within lacunae. In histology, a lacuna is a small space containing an osteocyte in bone or chondrocyte in cartilage.
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Elastic Cartilage

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​





​





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Elastic cartilage contains a lot of elastic fibers with  thin collagen fiberils in its matrix. As you would expect, this cartilage is more elastic
than hyaline cartilage. This exatra elasticity allows for better tolerance of repeated  bending.  The body has elastic cartilage tissue in the  eustacian tubes which regulate the inner ear pressure, it form the structure of the outer ear (the auricle) and it forms the epiglottis. The epiglottis, which bends down to cover the glottis (opening) of the larynx each time we swallow, is made of elastic cartilage, as is the highly bendable cartilage in the outer ear. Elastic cartilage contains chondrocytes that are dispersed within a a threadlike network of elastic fibrers. Elastic cartilage functions to  provides support. It also provides structure to the area. . 

​

Bone (Osseous Tissue)

Animated GIF Courtesy of ​Source dollysobsessionwithskulls.tumblr.com

via GIPHY

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Bone  is a tissue, also known as osseous tissue. Bone is alive and filled with blood vessels. It has incredible stregthe due to inorganic calcium salts  that form a rigid ground substance of the matrix. Bone functions in the body to provide structural support and protection to internal body structures. Bone is able to  withstand a great deal of compression and tension (pushing force and pulling force).  The primary cell of bone tissue is the osteoblast. Osteoblastss secrete the collagen fibers and the materials needed for the ground substance. These materials are then calcified by the addition of calcium salts which form the rigid ground substance of the bone.  When bone is mature, the matrix consists of collagen fibers surrounded by a calcified rigid ground substance. The osteoblasts mature into the osteocytes. The osteocytes reside in the lacunae filling up the space. 


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Bone tissue is a supportive type of connective tissue. It acts to shield the internal organs and to provide structure and support. Bone tissue includes compact bone and spongy bone. In bone, the matrix is rigid and described as calcified because of the deposited calcium salts.

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Blood

Animated GIF Courtesy of Source scinerds.tumblr.com

via GIPHY

Hematopoiesis

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​Fluid connective tissue includes lymph and blood. Various specialized cells circulate in a watery fluid containing salts, nutrients, and dissolved proteins. Red blood cells do not have a nucleus!  We don't see purple in the red blood cells, because there is no nucleus to take up the purple nuclear stain. Blood is pretty different from  the other connective tissue types. It is liquid  and it does not bind things
together or  provide any mechanical or structural support. However, it develops from the mesenchyme like the other connective tissue types.
     Blood consists of blood cells surrounded by a liquid  nonliving matrix called blood plasma. Its cells and matrix are very different
from those in other connective tissues. Blood functions as the transport vehicle for the cardiovascular system, carrying
defense cells, nutrients, wastes, respiratory gases, and many other substances throughout the body. 

Summary Table

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  • Ohm's Law Virtual Lab
  • New Page
  • Ch 8 - Nervous System