Let’s review… 1. What are the 2 types of Epithelial tissues? 2. What are the 2 types of Glands? 3. Describe the 4 shapes of cells— 4. What is the difference between “simple” and “stratified”? 5. What’s a “germ layer” ? 6. Define “distended”. 7. What are “goblet cells”? 8. What is “pseudostratified” columnar epithelium?
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Let’s review… 1.What are the 2 types of Epithelial tissues? 2.What are the 2 types of Glands? 3.Describe the 4 shapes of cells— 4.What is the difference.
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Transcript
Let’s review…
1. What are the 2 types of Epithelial tissues?
2. What are the 2 types of Glands?
3. Describe the 4 shapes of cells—
4. What is the difference between “simple” and “stratified”?
5. What’s a “germ layer” ?
6. Define “distended”.
7. What are “goblet cells”?
8. What is “pseudostratified” columnar epithelium?
… are the most abundant of all the 4 tissue types
The cells of connective tissue are far apart, separated by an abundant amount of extracellular material called …
cellcell
capillary
Basement membrane
matrix
fiberfiber
cell
Where do you find connective tisssue?
Everywhere
in the
body !!
Functions of connective tissue
1. Binding, supporting, packaging – holds other tissues in place2. Protection, defense, & repair – scar tissue, inflammation3. Insulation – fat cells or Adipose tissue4. Transportation - blood
Classification of Connective Tissues
Connective tissues are identified on the basis of three criteria:
1. Cell types
2. Kind, density, and arrangement of fibers
3. Amount & nature of the amorphous ground
substance
Ground substance + fibers =
Extracellular matrix
The CELLS found in connective tissues can be placed in 2 categories:
a. those that secrete the matrix or maintain it – cell type ends in –blast, –cyte, or -clast;
b. accessory cells which are supported by the connective tissue – fat-storing cells, white blood cells, and other cells that are involved in body defense and the elimination of dying/dead tissue cells;
The GROUND SUBSTANCE is the amorphous substance that fills the space between the cells and contains the fibers. It is composed of interstitial fluid (liquid between cells), proteins, and polysaccharides – the more polysaccharides the stiffer the ground substance.
FIBERS in the matrix provide strength. Three types of fibers are found in the connective tissue matrix:
1. Collagen fibers – white, very tough, high tensile strength
2. Elastic fibers – yellow, found where elasticity is needed like lungs and blood vessels
3. Reticular fibers – fine collagenous fibers, delicate branching network supporting soft organs like liver & spleen
Classification of connective tissues
BLOODInvolved in defense – fight infection and make antibodies; transportation of materials;