dxtxpx
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For each numbered statement of function described in items below, choose the most appropriate lettered component of junctional complex of associated structure. Answers may be used once, more than once or not at all
a) tight junctions (zona occludens)
b) adhesive junctions (zona adherens)
c) desmosome (macula adherens)
d) hemidesmosome
e) gap junctions (nexus)
f) microfilaments
g) tonofilaments
h) microtubules
1) this structure consist of hexagonal array of aqueous channels between cells. These pores allow free passage of ions so that adjacent cells are electrically coupled. Small regulatory molecules such as cyclic nucleotides can also pass thru these structures
2) this structure is thought to hold cells together. It consists of paired electron dense plaques on cytoplasmic faces of apposed membranes. Anchoring intermediate filaments rich in keratin insert into these plaques
3) The outer leaflets of the plasma membranes of adjacent cells come into direct contact. It forms a functional seal between a luminal and adluminal compartment
4) F-actin is most abundant and functionally important constituent of these structures
5) these structures attach epithelial cells to their subadjacent basement membranes
6) the part of junctional complex most directly responsible for minimizing fluid flow between epithelial cells
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| peekay
Forum Guru
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Posts: 588
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1-e---gap jxn
2-c----desmosomes
3-a--- tight jxn
4-f---microfilament
5-d----hemidesmosomes
6--b- zonula adherens
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| dxtxpx
Forum Guru
Topics: 259
Posts: 1,233
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peekay all are correct  except last one
Correct answers
1) e: gap juctions
2) c: desmosome
3) a: tight junctions
4) f: microfilaments
5) d: hemidesmosome
6) a: tight junctions
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