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4.3 Cell Shape & number of layers (cell shapes (squamous (the cells…
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4.4 connective tissues
connective tissue proper
fibroblast cell
these permanent residents are responsible for producing connective tissue fibers and ground substances
macrophages cell
are scattered throughout the matrix. these "big eater" cells engulf pr phagocytize, damaged cells or pathogens that enter the tissue
fat cells
typical adipocyte contains such large droplet of lipid that the nucleus and other organelles are squeezed to one side of the cell
mast cells
are small, mobile connective tissue cells often found near blood vessels.
Tissue fibers
collagen fibers
long straight, and unbranched. Strong and flexible fibers are the most common fibers in the connective tissue proper
elastic fibers
contain the protein elastin. They are branched and wavy and after stretching will return to their original length
reticular fibers
the least common of the three, are thinner than collagen fibers and commonly form a branching, interwoven framework in various organs
consists of many types of cells and fibers within a matrix containing a syrupy ground substance. examples: skin, fatty tissue, and tendons and ligaments
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fluid connective tissues
has a distinctive populationof cells suspended in a matrix containing dissolved proteins. two fluid connective tissues are blood and lymph
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