chapter 33 - Chapter 33: Animal Tissues and Organ Systems...

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Chapter 33: Animal Tissues and Organ Systems I. What is homeostasis? A. Constant dynamic physiological/metabolic responses to maintain “relatively constant” internal conditions II. Animal Tissues A. Epithelial tissue: ectodermal(outside body) and endodermal/endothelial(inside body) origin. Avascular-no blood vessels. 1. special characteristics: close packed cells; bound by tight junctions and desmosomes ( fig. 3 ); cell polarity (apical and basal surfaces); secrete basal lamina; always supported by underlying connective tissue; innervated but avascular; high regenerative ability. Classified by layers and cell type. 2. simple epithelial: single layer; forms lining of kidney tubules, internal digestive tract, lungs, urinary and reproductive ducts; function in absorption, secretion and filtration. Fig. 2 . 3. stratified epithelial: 2 or more layers; forms skin and linings of vagina, mouth and esophagus; functions in protection 4. glandular epithelial: form single or multicellular glands; form most endocrine- chemical releases into blood (hormones, paracrine) and all exocrine-anything released outside the body (sweat, mucous, oil, liver, salivary, pancreas) glands; primary function is secretion. Fig. 4 . Overall functions of epithelial cells:
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This note was uploaded on 04/26/2009 for the course BCOR 1010 taught by Professor Latier,jef during the Fall '07 term at Colorado.

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chapter 33 - Chapter 33: Animal Tissues and Organ Systems...

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