Biological sciences6

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Published on February 28, 2014

Author: vannessangel24

Source: slideshare.net

BIOLOGICAL SCIENCES By: MARIA KRISIA FAE DELOS REYES DE ASIS, BSN-RN

TISSUE LEVEL OF ORGANIZATION COVERING AND LINING EPITHELIUM - classified according to two characteristics: 1. Arrangement of cells in layers - Depends on the function a. SIMPLE EPITHELIUM - a single layer of cells that functions in DIFFUSION, OSMOSIS, FILTRATION, SECRETION, and ABSORPTION

TISSUE LEVEL OF ORGANIZATION b. PSEUDOSTRATIFIED EPITHELIUM - appears to have multiple layers of cells because the cell nuclei lie at different levels and not all cells reach the apical surface - cells that do not extend to the apical surface may contain cilia (TRACHEA & LUNGS); others (GOBLET CELLS) secrete mucus

TISSUE LEVEL OF ORGANIZATION - they are actually simple epithelium because all cells are attached to the basement membrane. However, they appear like stratified epithelium, thus the term pseudostratified; pseudo meaning “false”

TISSUE LEVEL OF ORGANIZATION c. STRATIFIED EPITHELIUM - consists of two or more layers of cells that protect underlying tissues and locations where there is considerable wear and tear

HARD PALATE

TISSUE LEVEL OF ORGANIZATION 2. Cell shapes a. SQUAMOUS CELLS - arranged like floor tiles and are thin, which allows the rapid passage of substances b. CUBOIDAL CELLS - as tall as they are wide and are shaped like cubes or hexagons. May have microvilli at apical surface (secretion/absorption)

TISSUE LEVEL OF ORGANIZATION c. COLUMNAR CELLS - consists of two or more layers of cells that protect underlying tissues and locations where there is considerable wear and tear d. TRANSITIONAL CELLS - change shape from flat to cuboidal. Ex. Uterus, urinary bladder

URINARY BLADDER

TISSUE LEVEL OF ORGANIZATION - Combining the two characteristics, the types of covering and lining epithelia are as follows: I. SIMPLE EPITHELIUM A. SIMPLE SQUAMOUS EPITHELIUM B. SIMPLE CUBOIDAL EPITHELIUM C. SIMPLE COLUMNAR EPITHELIUM (CILIATED AND NON-CILIATED) D. PSEUDOSTRATIFIED COLUMNAR EPITHELIUM (CILIATED AND NON-CILIATED)

TISSUE LEVEL OF ORGANIZATION II. STRATIFIED EPITHELIUM A. STRATIFIED SQUAMOUS EPITHELIUM (KERATINIZED AND NONKERATINIZED) B. STRATIFIED CUBOIDAL EPITHELIUM* C. STRATIFIED COLUMNAR EPITHELIUM* D. TRANSITIONAL EPITHELIUM * - based on the shape of the cells at the APICAL surface

GASTROINTESTINAL TRACT

Transitional epithelium

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