BIOL302 Study Guide - Midterm Guide: Ice Cream Cone, Exocrine Gland, Salivary Gland
18 Jun 2013
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Epithelium- function: protection, absorption, secretion, transport and barrier; no blood vessels; cells held together by cell junctions, polarity of cells allows for orientation of nuclei listed below; Rectangular with nuclei at the bottom and elongated. Usually secretory functions, cilia propels fluid/particles over surface. Well adapted to withstand abrasions since loss of cells does not affect underlying tissue. Makes urinary tract waterproof; and allows of stretch cubodinal. Lining of large excretory ducts, provides robust lining. Very dark stain, criss cross in the middle. Not very stable, allows cells to build in between/ anchor membranes. Anchored to cytoskeleton via intermediate filaments; 3rd junction. Happens right after adherein, made up of keratin. Stuff inbetween the cells are proteins that make up the junction. Consists of many cadherins; these build first and then tight junctions build. Brush border, very small, will not be able to see; less than 50% of nuclei size. Male repro system actin core, cannot actively move.
