8-31-06 EPITHELIUM

8-31-06 EPITHELIUM - Basement Membrane Anchors epithelium...

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Basement Membrane – Anchors epithelium to the underlying connective tissue GENERAL CHARACTERISTICS OF EPITHELIUM Display Polarity – displaying sidedness (nucleus present on one end of cells) o Bottom = Basal, Top = Apical o Refer to figure 4.5 of text book (T to B: nucleus, endoplasmic reticulum, golgi apparatus, secretory vesicles, microvilli) Epithelium is Avascular – contain NO blood vessels Regenerate very quickly – able to recover rapidly after being damaged o Over %90 of cancers are epithelial in origin because they divide so rapidly o Carcinoma – uncontrollable growth of epithelial cells FUNCTIONS OF EPITHELIAL CELLS 1. Absorption – selective permeability of certain nutrients, ions, etc…… a. Important in small Intestines (absorbing food, nutrients, etc….) 2. Secretion – Epithelial cells produce their own products which they secrete in order for the body to utilize a. Important in glands 3. Excretion and Filtration – two processes are closely coupled, take waste or
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This note was uploaded on 02/27/2008 for the course IPHY 3410 taught by Professor Tsai,pei-s during the Spring '08 term at Colorado.

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8-31-06 EPITHELIUM - Basement Membrane Anchors epithelium...

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