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18 Cards in this Set
- Front
- Back
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tissues |
building block of the body's organs |
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epithelial tissues |
a sheet of cell that covers a body surface or lines a body cavity |
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covering and lining epithelium |
covers the outer and inner surfaces of most body organs |
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glandular epithelium |
forms most of the body glands |
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functions of epithelia |
protection of underlying tissue, secretion, absorption, diffusion, filtration, sensory reception |
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secretion |
release of molecules from cells |
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absorption |
bringing small molecules into cells |
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cellularity |
composed almost etirely of cells |
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specialized contacts |
epithelial cells are directly joined together by special cell functions |
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polarity |
all have a free apical surfacee and an attached basal surface |
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avascular |
lacks blood vessels |
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innervated |
nerve endings penetrate the epithelial sheets |
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epithelial cells are classified by |
number of cell layers and shape of the cell |
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simple epithelial |
contains a single layer of cells, each cell attached to the basement membrane |
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stratified epithelial |
more than one layer of cells, cells on basal surface attach to basement membrane cells on apical surface border open space |
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squamous cells |
flat cells with flat, disc-shaped nuclei |
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cuboidal cells |
cube-shaped cells with spherical, centrally located nuclei |
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columnar cells |
taller than they are wide |
