Secretin is secreted when _________ touches alimentary canal.
Correct answer: A. Acidic
- A. Acidic
- B. Basic
- C. Neutral
- D. All of these
Explanation
Secretin is released by the duodenal mucosa when acidic chyme from the stomach enters the small intestine, and it stimulates bicarbonate secretion to neutralise that acid. Students may choose basic because bicarbonate is involved in the response, but the trigger is acidic chyme, not a basic substance.
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