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What is the site of amino acids absorption in human's small intestine?
- A. Duodenum
- B. Jejunum
- C. Ileum
- D. Both (2) and (3)
Correct Answer: D
Rationale: Amino acids are absorbed mainly in the jejunum and ileum of the small intestine.
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Which enzyme works in highly acidic pH
- A. Pepsin
- B. Lipase
- C. Erepsin
- D. Amylopsin
Correct Answer: A
Rationale: Pepsin functions optimally in the highly acidic pH of the stomach (around 1.8-2).
Which of the following is not a function of the pancreas?
- A. neutralization of gastric juice
- B. Production of amylase
- C. Secretion of lipases to break down fats into glycerol and fatty acids
- D. Secretion of pepsin
Correct Answer: D
Rationale: The pancreas does not secrete pepsin; this enzyme is produced by the stomach to digest proteins.
Taste buds are found in the following areas EXCEPT:
- A. Oral mucosa & soft palate
- B. Esophagus
- C. Laryngeal surface of Epiglottis
- D. Tongue papilla
Correct Answer: C
Rationale: Taste buds are absent in the esophagus; they are present on the tongue, soft palate, and epiglottis for taste perception.
The intestine has a large surface area. Why?
- A. To make the passage of nutrients through the intestine faster
- B. To make the passage of nutrients through the intestine slower
- C. To make absorption of nutrients more efficient
- D. To make the absorption of nutrients slower
Correct Answer: C
Rationale: A large surface area, due to villi and microvilli, enhances nutrient absorption efficiency.
Which food substance is absorbed, without digestion?
- A. Carbohydrates
- B. Proteins
- C. Vitamins
- D. Fats
Correct Answer: C
Rationale: Vitamins are absorbed without digestion, unlike macronutrients.