BIO 201 Fall 07 Lab 3 - A

BIO 201 Fall 07 Lab 3 - A - cells Epithelial Tissue •...

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Lab 3 - Histology
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Study of Tissues Four primary tissue classes Epithelial Connective Nervous Muscular Histology (microscopic anatomy) - study of  tissues and how they are arranged into  organs
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Epithelial Tissue Covers the external body surface, lines its  cavities and tubules, and generally marks off  “insides” from out outsides. Protection, absorption, filtration, excretion,  secretion , and sensory reception Consists of a flat sheet of closely adhering cells,  one or more cells thick, with the upper surface  usually exposed to the environment or to an  internal space in the body
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 Cellularity- closely packed cells   Specialized Contacts – fit closely together  Polarity – upper (apical) and lower (basal)  surfaces  Connective tissue support – rest upon CT  Avascular – lacking blood cells Regeneration – replacement of lost or damaged 
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Unformatted text preview: cells Epithelial Tissue • Distinguished from other tissues by: Structure of Epithelia • Lumen: empty cavity • Apical surface: faces away from basement membrane • Basal surface: faces the basement membrane • Basement membrane: between an epithelium and underlying connective tissue; serves to anchor an epithelium to the connective tissue below it Epithelial Tissue • Classified into two broad categories – Simple – Stratified • Four types in each category Simple Simple Stratified Stratified Simple Squamous Stratified Squamous Simple Cuboidal Stratified Cuboidal Simple Columnar *Stratified Columnar Psuedostratified Columnar Transitional Simple vs. Stratified • Simple – One layer of cells – Named for the shapes of their cells • Stratified – Ranges from 2-20 or more layers of cells – Named for the shapes of their surface cells...
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This note was uploaded on 05/01/2008 for the course BIO 201 taught by Professor Oberstein during the Spring '08 term at ASU.

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BIO 201 Fall 07 Lab 3 - A - cells Epithelial Tissue •...

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