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Epithelial Tissue

TermDefinition
two types Covering & Lining epithelium and glandular
Covering and lining epithelium found on free surfaces of the body such as the outer layer of skin; dips into open cavities of the digestive and respiratory tracts; lines blood vessels and the heart; covers walls of body cavities and the organs
Glandular makes up the glands of the body
functions of epithelial tissue protection, absorption, filtration, and secretion
6 special characteristics cellularity, specialized contacts, polarity, avascularity, basement membrane, and regneration
Cellularity epithelium composed almost entirely of cells; very little extracellular matrix
Specialized contacts adjacent cells are bound together by lateral contacts
Polarity has one free surface exposed to the body exterior or cavity of organ
Avascularity no blood vessels within; receives nourishment from underlying connective tissue
basement membrane epithelium rest on a basal lamina (non-living, adhesive material) which separates it from connective tissue
Regeneration as long as there is adequate nutrition lost cells can be replaced
Classification of epithelia (2 criteria) Shape of cell and number of cell layers present
Classification on shape Squamous, Cuboidal, columnar
squamous flattened, scale-like cells
cuboidal cells that are as tall as they are wide
columnar cells that are tall and column-shaped
Classification on number of layers simple and stratified
Simple consists of single layer
stratified consists of multiple layers of cells stacked on top of each other
simple squamous single layer of flattened cells; functions in diffusion and filtration (lungs, kidneys, and blood vessels)
simple cuboidal single layer of cube like cells; functions in secretion and absorption (kidney, small glands, and ovaries)
simple columnar single layer of tall cells; functions in secretion and absorption (digestive tract, bronchi, uterine tubes)
Created by: mchuan
 

 



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