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What Are Cell Junctions

Given below a...

Question

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.

A

1-Gap junctions, 2-Adhering junctions, 3-Tight junctions

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B

1-Tight junctions, 2-Adhering junctions, 3-Gap junctions

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C

1-Adhering junctions, 2-Tight junctions, 3-Gap junctions

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D

1-Gap junctions, 2-Tight junctions,
3-Adhering junctions

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Solution

The correct option is B 1-Tight junctions, 2-Adhering junctions, 3-Gap junctions
There are three types of cell junctions. They are:
1. Tight junctions: They help to stop substances from leaking across a tissue.
2. Adhering junctions: They perform cementing to keep neighbouring cells together.
3. Gap junctions: They facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells.

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Similar questions

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. 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. 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. Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.

Q. Assertion :Cell junctions are present in the epithelium and other tissues. Reason: Among cell junctions, adhering junctions help to stop substances from leaking across a tissue.

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