10.13.2006 - I functions A covers outside of the body B...

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5/7/2009 I. functions A. covers outside of the body B. lines organs and cavities inside of the body: absorption secretion, sensory C. a barrier: protection against injury, invasion and fluid loss II. Structure A. free surface ( = a layer of cells exposed to air or fluid) attached to a basement membrane (extracellular matrix, not a lipid bilayer) B. Cells are tightly p acked III. Types: A. simple squamous 1. single layer of free surface cells 2. adapted fro diffusion (thin and leaky) 3. examples: lines blood vessels, lungs, kidneys B. C. Simple columnar 1. single layer of free surface cells 2. absorbs nutrients 3. secretes enzymes 4. examples: lines intestines and stomach D. Stratified squamous 1. several layers of cells attached to the basement membrane 2. cells are easily sloughed off and replaced from layers below 3. found in areas of high impact/abrasion (external: skin; internal; esophagus) E. Stratified columnar 1. several layers of cells attached to the basement membrane 2. function: secretion of mucus and protection 3.
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