Process of absorption of nutrients is carried out by

Correct Answer: D

Rationale: Nutrient absorption involves passive, facilitated, and active transport mechanisms.

Correct Answer: A

Rationale: Carbohydrates are the primary component of most diets.

Correct Answer: B

Rationale: In fasting, carbohydrates (glycogen) are used first, followed by fats, and then proteins.

Correct Answer: C

Rationale: Parietal cells secrete HCl; if nonfunctional, the stomach pH rises, reducing pepsin's protein digestion efficiency.