- A Mucus secreted by Brunner's glands alone
- B Bile pigments released from the liver
- C Reabsorption of acid by the duodenal epithelium
- D Bicarbonate ions secreted in pancreatic juice
Correct answer: D. Bicarbonate ions secreted in pancreatic juice
Explanation: Pancreatic juice is rich in bicarbonate ions, which neutralize the acidic chyme as it enters the duodenum, creating a suitable pH for pancreatic enzyme activity.
Concept context
The digestive tract, digestive enzymes, hormonal control of digestion, and liver function. High NEET weightage.