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What Are Cell Junctions

How are tight...

Question

How are tight junction formed between neighbouring cells of epithelial tissue?

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Solution

Occludin proteins bind plasma membranes of 2 cells together to form tight junctions and prevent leakage..

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Similar questions

Q. Choose the correct answer from the options given below:
I. Tight junctions, gap junctions and adherens junctions are different types of cell junctions.
II. They are located in connective tissue, epithelial tissue, neural tissue and muscular tissue.

Q. Observe the figure of plasma membrane exhibiting cell junctions of various epithelial tissue and match from a to c with respective features.
1. Protein complexes that occur at cell - cell junctions in epithelial and endothelial tissues.
2. Gap junction or nexus are separated by a distance of 30-50

˚ A

by the number of pipe-like structures that extend from the cytosol of one cell to other by cylindrical proteins called connexons.
3. Tight junction form fluid tight seals between cells.

Column I	Column II
A. Tight junctions	i. Cement neighbouring cells together to form a sheet
B. Adhering junctions	ii. Extracellular matrix supporting the epithelial cells
C. Gap junction	iii. Establish a barrier to prevent leakage of fluid across epithelial cells
D. Basement membrane	iv. Cytoplasmic channels to facilitate to communication between adjacent cells

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. Assertion :Materials cannot be exchanged between epithelial cells. Reason: Blood vessels are absent in epithelial tissue.

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