What is the function of the simple columnar epithelium?

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Secretion

Excretion

Absorption

All of the above

answer is D.

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Detailed Solution

Concept: Simple columnar epithelial cells' primary purpose is defence. For example, the stomach and digestive system epithelium creates an impenetrable barrier to any germs that may be consumed while being permeable to any essential ions. In the colon, this role is very significant.
The simple columnar epithelial tissue lines most part of the digestive tract of humans which include both Intestines, Stomach. The function of this tissue is to perform functions like secretion, excretion, and absorption in the digestive tract.
Hence, option 4 is the correct answer.

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