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Tight Junction

Which of the ...

Question

Which of the following is incorrect with respect to the junction and its function?

A

Tight junction – Promotes leaking of substances across a tissue

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B

Adhering junction – Keeps neighbouring cells together

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C

Gap junction – Connects the cytoplasm of adjoining cells for rapid transfer of ions and small molecules

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D

Gap junction – Helps the cells to communicate with each other

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Solution

The correct option is A Tight junction – Promotes leaking of substances across a tissue
Tight junctions between cells prevent leaking of substances across a tissue.

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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. 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. Match the following:

1. Tight junctions	i. Help cells communicate with each other
2. Gap junctions	ii. Provides anchoring function
3. Adherens junctions	iii. Prevent substances from leaking across the tissue

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.

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