- A Carbohydrate digestion products alone, triggering salivary amylase secretion reflexively each time
- B Fat and protein in duodenum; it stimulates pancreatic enzyme secretion and gall bladder contraction
- C Mechanical distension from water intake alone, activating duodenal stretch receptors directly
- D Glucose concentration sensed mainly by enteroendocrine K-cells located nearby in the gut
Correct answer: B. Fat and protein in duodenum; it stimulates pancreatic enzyme secretion and gall bladder contraction
Explanation: CCK: released by duodenal I-cells when fat and protein enter. Stimulates pancreatic acinar cells (enzymes: lipase, protease), gall bladder contraction, and hepatic bile secretion.
Concept context
The digestive tract, digestive enzymes, hormonal control of digestion, and liver function. High NEET weightage.