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Pnb 2264 Exam 2 Review Questions And Correct Answers

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PNB 2264 EXAM 2 REVIEW QUESTIONS AND CORRECT ANSWERS

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PNB 2264 EXAM 2 REVIEW QUESTIONS AND
CORRECT ANSWERS

◉ Paracellular transport.
Answer: transport between cells


◉ tight junctions.
Answer: specialized connections between adjacent cell membranes
that are impermeable- like a zipper, formed by claudin


◉ hemidesomes.
Answer: link epithelial cells to basement membrane/connective
tissue


◉ desmosomes.
Answer: link two adjacent cells by membrane protein plaques linked
to cell filaments


◉ what surfaces do epithelial cell arrangement create?.
Answer: apical and basolateral surfaces


◉ apical surface.

, Answer: exposed to external body cavities or lumens of hollow
organs


◉ basolateral surfaces.
Answer: tethered to basement membrane


◉ basement membrane.
Answer: composed of connective tissue and critical to underlying
cell matrix- responsible for establishing boundaries, resisting tears,
and reinforcing tissues


◉ microvilli and cilia.
Answer: both are on apical surface and propel movement


◉ why is polarity important in epithelial cells?.
Answer: avascular so polarity is needed for selective movement of
substances between openings and lumens and the bloodstream


◉ simple tissue.
Answer: single layer that is desired for absorption secretion or
filtration


◉ stratified tissue.

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