Nokea
Which features make a villus well adapted for absorbing amino acids from the ileum?
- A. large surface area, thin walls, lacteal
- B. large surface area: volume ratio, good blood supply, thin walls
- C. small surface area, good blood supply, lacteal
- D. small surface area: volume ratio, good blood supply, thin walls
Correct Answer: B
Rationale: Villi have a large surface area to volume ratio, good blood supply, and thin walls, facilitating efficient absorption of nutrients such as amino acids.
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Exocrine portion of pancreas show the following EXCEPT:
- A. Formed of pure serous acini with centroacinar cells
- B. Its duct system is rich in striated ducts
- C. Secretion of bicarbonate is stimulated by secretin hormone.
- D. Secretion of enzymes is stimulated by cholecystokinin
Correct Answer: B
Rationale: The pancreatic duct system has intercalated ducts, not striated ducts, which are characteristic of salivary glands.
Enzyme maltase in human gut acts on food at a pH of -
- A. More than 7 to change starch into maltose.
- B. Less than 7 to change starch into maltose.
- C. More than 7 to change maltose into glucose.
- D. Less than 7 to change maltose into glucose.
Correct Answer: C
Rationale: Maltase works in the small intestine (pH > 7) to convert maltose into glucose.
Enteroendocrine cells of stomach, show the following EXCEPT:
- A. Stained with silver nitrate or chromium salts.
- B. Have apical secretory granules.
- C. Divided into open type & closed type.
- D. Are also called argentaffin cells.
Correct Answer: B
Rationale: Enteroendocrine cells have basal secretory granules, not apical, as they release hormones into the bloodstream.
Which of the following enzyme is secreted by pancreas -
- A. Maltase
- B. Trypsin
- C. Rennin
- D. Lactase
Correct Answer: B
Rationale: Trypsin, a proteolytic enzyme, is secreted by the pancreas.
What additional role does the pancreas play?
- A. Regulates blood sugar
- B. Produces bile
- C. Stores vitamins
- D. Secretes mucus
Correct Answer: A
Rationale: The pancreas has an endocrine role, releasing insulin and glucagon to regulate blood sugar.