Question

Assertion: The inner lining of small intestine has numerous fingers like projection called villi.
Reason: The villi increase the surface area for absorption.​

Answer 1

Answer:

• Accepted Answer: The inner lining of the small intestine has numerous finger-like projections called villi which increase the surface area for absorption. The villi are richly supplied with blood vessels. They take the absorbed food to each and every cell of the body, where it is utilised for obtaining energy.

Answer 2

Both Assertion and Reason are true is the correct option

Explanation:

The inner lining of small intestine:

• Villi are finger-like extensions on the small intestine's inner lining that increase the surface area available for absorption. The villi have a lot of blood arteries in them.
• They transport the absorbed food to every cell in the body, where it is used to generate energy. The mucosa is a mucous membrane that secretes digestive enzymes and hormones and is the innermost tissue layer of the small intestines. The mucosa surrounds the intestinal villi.

The villi increase the surface area for absorption:

• The villi of the small intestine protrude into the intestinal cavity, considerably increasing the surface area available for food absorption and increasing the amount of digestive fluids produced.
• Villi can be found in concentrations ranging from 10 to 40 per square millimetre (6,000 to 25,000 per square inch) of tissue.