4.3 Cell Shape & number of layers
cell layers
Simple epithelium
thin
a single layer of cells is fragile snd can't provide much mechianical protection
found only in protected areas inside the body
stratified epithelium
provides a greater degree of protection
has several layers of cells above the basement membrane.
found in subject to mechanical or chemical stress. surface of Skin, and the linings of the mouth and anus
cell shapes
squamous
the cells are thin and flat
cells look like fried eggs laid side by side
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4.4 connective tissues
connective tissue proper
fluid connective tissues
supporting connective tissues
have a less diverse cell population
matrix of dense ground substance
closely packed fibers
fibroblast cell
macrophages cell
fat cells
mast cells
Tissue fibers
collagen fibers
elastic fibers
reticular fibers
typical adipocyte contains such large droplet of lipid that the nucleus and other organelles are squeezed to one side of the cell
these permanent residents are responsible for producing connective tissue fibers and ground substances
are scattered throughout the matrix. these "big eater" cells engulf pr phagocytize, damaged cells or pathogens that enter the tissue
are small, mobile connective tissue cells often found near blood vessels.
the least common of the three, are thinner than collagen fibers and commonly form a branching, interwoven framework in various organs
long straight, and unbranched. Strong and flexible fibers are the most common fibers in the connective tissue proper
contain the protein elastin. They are branched and wavy and after stretching will return to their original length
consists of many types of cells and fibers within a matrix containing a syrupy ground substance. examples: skin, fatty tissue, and tendons and ligaments
has a distinctive populationof cells suspended in a matrix containing dissolved proteins. two fluid connective tissues are blood and lymph
blood
lymph
contained in cardiovascular system
contain in lymphoid system
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