Nokea
Which of the following hormones is responsible for stimulating gallbladder contraction and the release of bile into the small intestine during the intestinal phase of digestion?
- A. Cholecystokinin (CCK)
- B. Secretin
- C. Gastrin
- D. Glucagon
Correct Answer: A
Rationale: CCK, released in response to fats in the duodenum, stimulates gallbladder contraction and bile release for fat digestion.
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About nasopharynx all true except:
- A. Lined by pseudostratified epith.
- B. Contain pharyngeal tonsil.
- C. Contain palatine tonsil
- D. Follow nasal cavity.
Correct Answer: C
Rationale: The nasopharynx is lined by pseudostratified ciliated epithelium and contains the pharyngeal tonsil (adenoids), but the palatine tonsils are located in the oropharynx, not the nasopharynx.
Which of the following hydrolytic enzymes act in low pH?
- A. Peroxidases
- B. Hydrolases
- C. Amylases
- D. Proteases
Correct Answer: D
Rationale: Proteases, such as pepsin, function optimally in the low pH environment of the stomach.
Having reduced amounts of Anti Diuretic hormone does what:
- A. Decrease urine production making it dark in colour
- B. Makes us lose water by increased sweating
- C. Increase urine production making it insipid
- D. Causes water retention in tissues
Correct Answer: C
Rationale: Reduced ADH increases urine output, making it dilute (insipid) due to less water reabsorption.
The function of the parietal cells of the stomach is to:
- A. Secrete pepsinogen for protein digestion
- B. Secrete mucus for lubrication
- C. Secrete the hormone gastrin
- D. Produce intrinsic factor required for absorption of vitamin B12
Correct Answer: D
Rationale: Parietal cells produce intrinsic factor, essential for vitamin B12 absorption, and hydrochloric acid, not the other functions listed.
Which element in the molecule of urea shows that it is formed from amino acids and not from glucose?
- A. carbon
- B. hydrogen
- C. nitrogen
- D. oxygen
Correct Answer: C
Rationale: Nitrogen is a key component of amino acids and is retained in urea during deamination.