1. Which of the following nutrients is absorbed directly into the blood

from the intestinal villus?

 A) Fatty acids

 B) Monosaccharides

 C) Amino acids

 D) Glycerol

 Answer: B) Monosaccharides. Rationale: Monosaccharides such as

glucose are absorbed directly into the blood via facilitated diffusion

through the intestinal villi.

2. The absorption of what vitamin requires intrinsic factor to be present?

 A) Vitamin A

 B) Vitamin B12

 C) Vitamin C

 D) Vitamin D

 Answer: B) Vitamin B12. Rationale: Vitamin B12 absorption in the

ileum requires intrinsic factor, which is secreted by gastric parietal cells.

3. Which process describes the movement of water and electrolytes from

the gut lumen into the epithelial cells?

 A) Passive diffusion

 B) Active transport

 C) Osmosis

 D) Facilitated diffusion

 Answer: C) Osmosis. Rationale: Osmosis is the process by which water

moves across a semipermeable membrane from an area of low solute

concentration to high solute concentration.

4. What is the primary site for absorption of nutrients in the

gastrointestinal tract?

 A) Stomach

 B) Duodenum

 C) Jejunum

 D) Ileum

 Answer: C) Jejunum. Rationale: The jejunum, with its large surface area

due to villi and microvilli, is the primary site for nutrient absorption.

5. Which of the following mechanisms is primarily used for glucose