they close the space between cells – with the close space, they fuse their cell membranesEXAMPLE: cells lining small intestine
how do tight junctions connect cells?
The process of closing the space between cells and fusing the cell membranes is known as cell junction. There are different types of cell junctions, and each serves a different function in cells.
The specific type of cell junction you are referring to in this example is called tight junctions. Tight junctions are specialized structures that seal the gaps between adjacent cells to create a barrier, which prevents the diffusion of molecules and ions between cells. Tight junctions are critical for maintaining the integrity of epithelial cell layers, such as those found in the small intestine.
In the small intestine, tight junctions between the epithelial cells lining the intestine prevent unwanted substances from passing through the intestinal wall, while allowing the selective uptake of nutrients and water. This tight barrier helps to prevent infection and maintain proper nutrient absorption.
The fusion of cell membranes and formation of tight junctions involve the assembly of specialized proteins, such as claudins, occludins, and junctional adhesion molecules. These proteins interact to form a complex structure that seals off the space between cells.
In summary, the fusion of cell membranes through tight junctions is an essential process that maintains the selective permeability of epithelial cell layers like those found in the small intestine, preventing unwanted substances from passing through the tissue and allowing the uptake of nutrients.
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