Nokea
Surface epithelium of gastric mucosa:
- A. Secretes acidic mucous to form a protective gel
- B. Secretes neutral to alkaline mucus rich in bicarbonate to form a protective gel
- C. Shows basal basophilia & apical acidophilia
- D. Have pale cytoplasm & flattened basal nuclei
Correct Answer: B
Rationale: The gastric surface epithelium secretes neutral to alkaline mucus with bicarbonate to protect the mucosa from acid and pepsin.
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Of the following, which organ does food NOT pass through?
- A. pancreas
- B. stomach
- C. mouth
- D. small intestine
Correct Answer: A
Rationale: Food does not pass through the pancreas; it produces digestive enzymes that aid digestion.
Which of the following is absorbed in ileum-
- A. Fat
- B. Bile salts
- C. Vit-K
- D. Glucose
Correct Answer: B
Rationale: Bile salts are reabsorbed in the ileum.
Which layer of GI tract forms the innermost lining and continuously secretes mucus?
- A. serosa
- B. muscularis externa
- C. muscularis mucosa
- D. mucosa
Correct Answer: D
Rationale: The mucosa is the innermost layer of the GI tract, lined with epithelial cells that secrete mucus to protect the tract and lubricate food passage.
Infants' gastric juice contains
- A. Nuclease, pepsinogen, lipase
- B. Maltase, pepsinogen, rennin
- C. Amylase, rennin, pepsinogen
- D. Pepsinogen, lipase, rennin
Correct Answer: D
Rationale: Infants' gastric juice contains pepsinogen, lipase, and rennin to aid in milk digestion.
Which of the following would MOST directly affect the operations of the digestive system?
- A. osteoporosis
- B. liver damage
- C. heart attack
- D. kidney failure
Correct Answer: B
Rationale: Liver damage directly impacts digestion by reducing bile production, essential for fat breakdown.