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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 glucoseÂ
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