Nokea
What role does the stomach play in the maintenance of normal vitamin B12 levels?
- A. Produces intrinsic factor
- B. Absorbs vitamin B12
- C. Stores vitamin B12
- D. Converts vitamin B12
Correct Answer: A
Rationale: The stomach's parietal cells produce intrinsic factor, necessary for vitamin B12 absorption in the ileum.
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The hardest constituent of the tooth is-
- A. Enamel
- B. Dentine
- C. Bone
- D. Pulp
Correct Answer: A
Rationale: Enamel is the hardest substance in the human body, protecting the tooth's inner layers.
Water absorption mainly occur in :-
- A. Buccal cavity
- B. Intestine
- C. Stomach
- D. Appendix
Correct Answer: B
Rationale: The intestine, especially the large intestine, is the primary site for water absorption.
Obstruction of the common bile duct by gallstones would most likely affect the digestion of:
- A. carbohydrates
- B. fats
- C. proteins
- D. nucleic acids
Correct Answer: B
Rationale: Bile is essential for the emulsification and digestion of fats. An obstruction in the common bile duct would impair fat digestion.
Which of the following describes one function of the stomach?
- A. To introduce carbohydrates to food.
- B. To remove excess water from food.
- C. To temporarily store food.
- D. To absorb nutrients into the bloodstream.
Correct Answer: C
Rationale: The stomach temporarily stores food, mixing it with gastric juices for digestion.
What is the structural composition of the liver?
- A. Composed of lobules with hepatocytes radiating from a central vein
- B. Composed of flat epithelial sheets
- C. Composed of acini surrounding ducts
- D. Composed of fibrous tissue only
Correct Answer: A
Rationale: The liver consists of lobules, functional units where hepatocytes radiate from a central vein, facilitating its metabolic roles.