Question

. Name the types of cell junctions in epithelium and their function.​

Answer 1

Answer:

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Three are different types of connecting junctions, that bind the cells together. adhering junctions (zonula adherens). desmosomes (macula adherens). There are also 'hemidesmosomes' that lie on the basal membrane, to help stick the cells to the underlying basal lamina.

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Answer 2

Answer:

1)occluding junctions (zonula occludens or tight junctions)

2)adhering junctions (zonula adherens).

3)desmosomes (macula adherens)

4) gap junction

Explanation:

function 1)This type of junction greatly restricts the passage of water, electrolytes and other small molecules across the epithelium. Transmembrane proteins from each cell membrane interlock across the intercellular space, all around the cell, in this belt.

2)Epithelial cells are held together by strong anchoring (zonula adherens) junctions.

The adherens junction lies below the tight junction (occluding junction). In the gap (about 15-20nm) between the two cells, there is a protein called cadherin - a cell membrane glycoprotein. (The type of cadherin found here is E-cadherin). The cadherins from adjacent cells interact to 'zipper' up the two cells together.

Inside the cell, actin filaments (microfilaments, shown here in red) join up the the adhesion junctions. These filaments tend to be arranged circumferentially around the cell, as a 'marginal' band.

3)Desmosomes connect two cells together.

4)A group of protein molecules called connexins form a structure called a connexon. When connexons from two adjacent cells align, they form a continuous channel between them.

This channel is big enough to allow small molecules such as inorganic ions, and other small water soluble molecules (smaller than 1000kDa) to pass between the cells. However the channel is too small for proteins, nucleic acids or sugars to pass through.

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