What is the function of the epithelial tissue Class 9?

Epithelial tissues serve various vital functions in the body, such as protection, absorption, filtration, excretion, secretion, and sensory reception. They form protective barriers against external elements, line internal organs, and facilitate the exchange of substances with the surrounding environment.

In Class 9, the function of epithelial tissue is typically explained as follows:

1. Protection: Epithelial tissue forms protective layers over the body surfaces and organs, preventing physical damage, pathogens, and dehydration.
2. Secretion: It is involved in the secretion of various substances like enzymes, hormones, and mucus in glands.
3. Absorption: Epithelial tissue helps in the absorption of nutrients in organs like the intestines.
4. Excretion: It assists in the excretion of waste products from the body through structures like sweat glands and kidney tubules.
5. Sensation: Certain epithelial tissues, like those in the skin, help in detecting sensations such as heat, pressure, and pain.
6. Transport: Some epithelial tissues are involved in the transport of substances (e.g., gases, nutrients) across body surfaces.