Question

write a function of the tight junctions of epithelial tissues ​

Answer 1

Answer:

Function of Tight Junctions

Tight junctions have several different functions. Their most important functions are to help cells form a barrier that prevents molecules from getting through, and to stop proteins in the cell membrane from moving around. Tight junctions are often found at epithelial cells, which are cells that line the surface of the body and line body cavities. Not only do epithelial cells separate the body from the surrounding environment, they also separate surfaces within the body. Therefore, it is very important that the permeability of molecules through layers of epithelial cells is tightly controlled.

Another function of tight junctions is simply to hold cells together. The branching protein strands of tight junctions link adjacent cells together tightly so that they form a sheet. These strands are anchored to microfilaments, part of the cell’s cytoskeleton that is made up of long strands of actin proteins. Microfilaments are located inside the cell, so the combination of microfilaments and sealing strands anchors the cells together from the inside and the outside.

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