Which of the following parts of the digestive system has the most important role in nutrient absorption?

Correct Answer: D

Rationale: The small intestine is the primary site for nutrient absorption due to its large surface area and specialized structures like villi and microvilli.

Correct Answer: D

Rationale: Rennin is responsible for the digestion of milk protein. Rennin is present in the human body in its inactive form called prorenin. When we consume milk, it reacts with the hydrochloric acid present in the stomach. Hydrochloric acid activates the inert prorenin and converts it into active Rennin.

Correct Answer: A

Rationale: Mucus or Gastric mucus is a gel barrier secreted by epithelial cells & glandular cells in the stomach wall. It protects the inner lining of the stomach from HCl.

Correct Answer: C

Rationale: Assimilation involves using absorbed nutrients to synthesize cellular components; building proteins from amino acids is a prime example.

Correct Answer: A

Rationale: Amino acids and glucose enter the blood capillaries, while fatty acids and glycerol are absorbed into the lacteals.