Quiz 1 - Epithelial tissues Flashcards Preview

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Flashcards in Quiz 1 - Epithelial tissues Deck (19):
1

Characterists of Epithelial tissues (CRAAAP)

cellularity, regeneration, attachments, avascular, arranged in sheets or layers, polarity

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cellularity

cells are bound close together

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regeneration

cells continuously replaced via cell divison

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attachment

attached to the basal lamina

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avascular

no blood vessels

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arranged in sheets or layers

composed of one or more layers of cells, tightly packed

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polarity (two types)

apical surface - exposed to external or internal surfaces
basal surface - attached to other things (tissues, etc.)

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Functions of Epithelial tissues (PPSS)

physical protection
control permeability
provide sensation
produce secretions

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Movement of fluids through epithelium

microvilli and cilia

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microvilli

for absorption and secretion

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cilia

moves substances over apical surfaces

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How does the epithelium maintain its integrity?

intercellular connections
attachment to basal lamina
epithelial maintenance and renewal

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Classification of epithelium

two types of layers : simple and stratified

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simple layers

single layer of cells, specialized for transportation (absorption, secretion)

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stratified layers

two or more layers of cells, specialized for physical protection

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Different types based on shapes

squamos, cuboidal, columnar

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squamos

thin, flat cells - "squished" nuclei

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cuboidal

cube-shaped cells - centered, round nucleus

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columnar

longer than they are wide, nucleus near base