Which of the following is (are) NOT important as a stimulus in the gastric phase of gastric secretion?
peptides
distention
low acidity
carbohydrates
The Correct Answer is D
A. Peptides: Peptides in the stomach stimulate G cells to release gastrin, which enhances gastric secretion.
B. Distention: Stretch receptors in the stomach wall respond to distention and activate gastric secretions via reflexes.
C. Low acidity: A rise in pH (low acidity) following food entry triggers gastrin release.
D. Carbohydrates: Carbohydrates do not significantly stimulate gastric secretions; proteins are the primary stimulus during the gastric phase.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Intrinsic factor: Intrinsic factor, secreted by parietal cells, is essential for vitamin B₁₂ absorption in the ileum. Vitamin B₁₂ is needed for RBC production and hemoglobin synthesis.
B. Gastric lipase: Gastric lipase breaks down lipids, not involved in hemoglobin production.
C. Pepsinogen: Pepsinogen is converted to pepsin, which digests proteins-not related to RBC or hemoglobin synthesis.
D. HCl: Hydrochloric acid helps activate enzymes and digest food, but does not directly influence hemoglobin production.
Correct Answer is C
Explanation
A. Cooling of the mouth: This causes temporary inhibition of thirst but does not last long-term.
B. Distension of the stomach by ingested water: Stomach distension contributes to short-term thirst relief.
C. A drop in blood osmolarity: This indicates proper hydration and is the main signal for the hypothalamus to turn off the thirst mechanism.
D. Moistening of the mouth: Like cooling, moistening the mouth only provides short-term relief from thirst.
E. Increased salivation: Increased salivation can be a result of hydration but does not directly regulate thirst.
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