USMLE Forum Archives - USMLE Step 1 - Histology
Histology
mohhaider - 08-01-08 05:58
Which structure most effectively prevents toxic molecules from penetrating an epithelium by passing between adjacent epithelial cells?
(A) desmosome
(B) gap junction
(C) hemidesmosome
(D) terminal bar
(E) tight junction
mohhaider - 08-01-08 05:58
Which structure most effectively prevents toxic molecules from penetrating an epithelium by passing between adjacent epithelial cells?
(A) desmosome
(B) gap junction
(C) hemidesmosome
(D) terminal bar
(E) tight junction
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#2
Re: Histology
mohhaider - 08-01-08 06:23 Correct .
The space between plasmalemmas of adjacent epithelial cells is obliterated at the tight junction (zonula occludens), which forms by fusion of the membranes along narrow anastomosing bands.
#3
Re: Histology babbu5508 - 07-28-10 04:02 tight junctions.., or zonula occludens, are the closely associated areas of two cells whose membranes join together forming a virtually impermeable barrier to fluid.
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