Epithelial tissue | To the point | Biology Hubspot - Definition and Examples of Biology Terms


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Wednesday, February 27, 2019

Epithelial tissue | To the point

Epithelial tissue

The epithelial tissue consists of single or multiple cell layers that are arranged in sheets. It forms the covering and lining of various organs in the body.
The space between the adjacent plasma membrane of epithelial cells is quite small due to the closely packed arranged of cells.
The major functions of the epithelial tissue are grouped as under:
1) It acts as a barrier that controls the movements of materials into and out of the body.
2) It helps in the secretion of cell products via its secretory surfaces.
3) Protects the body from abrasive conditions of the environment.
The rate of cell division in epithelial tissue is quite high so that dead or injured cells can be removed or repaired quickly. It combines with the nervous tissue to form sense organs.
Epithelial tissue possesses its own nerve supply but lacks its own blood vessels. The connective tissue located adjacent to the epithelial tissue supplies nutrients and removes wastes from it. The exchange of substances occurs via diffusion.
The epithelial tissue is of two types:
a) Covering and lining epithelium: - This type of epithelial tissue forms covering around the skin, some internal organs, blood vessels, ducts and interior of the different body systems.
b) Glandular epithelium:- This type forms secreting portions of various body glands like thyroid gland, adrenal gland etc.

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