Ch 40 - animal form and function (3 slides per page)

Tightly packed cells joined together laterally via

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Unformatted text preview: lls • Joined together laterally via tight junctions • Very little interstitial fluid between cells Where does it occur? 1. Surfaces that interface w/ outside • epidermis, cornea, mouth, rectum • digestive, respiratory, reproductive, and urinary tracts 2. Top & bottom ends differ (i.e. it is polarized) • Free surface exposed to outside or inside (lumen) of organ or duct • Attached surface resting on underlying connective tissue 3. Separated from the underlying tissue by a basement membrane • Thin sheet of collagen and proteins • Produced by epithelial cells and partly by underlying connective tissue cells. 2. Lines vessels & ducts Peritoneum 3. Glands (skin, liver etc.) 4. Membranes (peritoneal, pericardial, pleural etc.) 24 25 Epithelial Tissue Main functions: A. Protection • mechanical damage • chemical damage • desiccation • infection • cleaning (cilia, mucus) B. Metabolic • absorption • secretion (glands) In pseudostratified, all cells contact basal lamina but not all reach surface 1. # of layers: In stratified, the basal cell layer does not reach the surface • simple = 1 layer • stratified = > 1 layer • Pseudostratified = 1 layer but 2. cell shape: squamous Intestine Trachea Epithelial Tissue Classified based on: apical layer cuboidal columnar microvilli Know 5 possible types but do not need to know where each type occurs as described in figure 40.5 • ciliated (but DO know where epithelial tissue in general occurs) • glandular • keratinized e.g. keratinized stratified squamous or cili...
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This note was uploaded on 02/12/2014 for the course BIOLOGY 2011 taught by Professor Woo during the Fall '10 term at University of Central Florida.

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