Question

In: Anatomy and Physiology

Tight junctions: a. allow communication between cells and an exchange of ions b. cause cell membranes...

Tight junctions:

a. allow communication between cells and an exchange of ions

b. cause cell membranes to tightly fuse together

c. extend around the cell like a belt

d. connect adjacent cells and their cytoskeleton

e. all of the above

Solutions

Expert Solution

Answer is option (b)Cause cell membrane to tightly fuse together

Tight junction is a watertight seal between 2 cells.It acts by sealing adjascent epithelial cells of cells.They do not the passage of ions and molecules between cells.So option(a) is not true.

In tight junctions, consists of claudins and other protein molecules. Series of protein of adjascent plasma membranes of adjascent cells fuse together in a tight junction to produce an impermeable junction. So option (b) is correct

It forms an adhesive seal which allows the epithelia to seperate the inside of the cell from exterior. Only continuouos tight junctions will extend around the cell like belt.There are discontinuous tight junctions which do not seal the cell like a belt. So, optio(c) is not true

Junctions which helps to link each cell's internal skeleton is anchoring junctions.They are desmosomes. Tight junctions does not connect adjascent cell's cytoskeletons. So option (d) is not correct

Sydney Mullin answered 1 year ago
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