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Tight Junction

Gap junctions...

Question

Gap junctions?

A

Help to stop substances from leaking across a tissue

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B

Perform cementing to keep neighbouring cells together

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C

Provide stretch ability to the epithelium

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D

Facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells

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Solution

The correct option is D Facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells
Cell junctions are cellular structures comprising of multiprotein complexes. They provide adhesion between adjascent cells. They are basically of 4 types.
occluding junctions (zona occludens or tight junctions)
adhering junction (zona adherens)
desmosomes (macula adherens)
gap junctions (nexus) : they are communicating links between neighbouring cells.
So, the correct option is D.

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Similar questions

Q. Assertion: Gap junctions perform cementing function to keep the neighbouring cells together.

Reason: Tight junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small and big molecules, etc.

Q. Given below are the functions of cell junctions.
1. Help to stop substances from leaking across a tissue.
2. Perform cementing to keep neighbouring cells together.
3. Facilitate the cells to communicate.

Choose the correct option.

Q. Read the following statements and choose the correct answer.

I. Gap junctions cement adjacent cells together.
II. Areolar tissue contains fibroblasts, macrophages and mast cells.
III. Tight junctions facilitate the cells to communicate with each other.
IV. Adhering junctions help to stop substances from leaking across tissues.
V. Cells of connective tissue except blood secrete fibers of structural proteins called elastin.

Q. Select the correct option:

Which of the following statements about cell junctions are correct?
(i) All the cells of the epithelium are held together with little intercellular materials
(ii) In almost all animal tissues specialised junctions provide both structural and functional link between its individual cells
(iii) Tight junctions prevent substances from leaking across a tissue
(iv) Adhering junctions provide cementing to keep neighbouring cells together.
(v) Gap junctions provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.

Q. Which type of junction faciliitates the cells to communicate with each other by connecting the cytoplasm of adjoing cells?

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