🔬 Biology · Digestion and Absorption · NEET

Chyme entering the duodenum from the stomach is strongly acidic. Its pH is raised mainly by:

Answer: Bicarbonate ions secreted in pancreatic juice.

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.

Labeled diagram of the human digestive system showing mouth, esophagus, stomach, liver, pancreas, small intestine, and large intestine

The human digestive system. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.

Concept context

The digestive tract, digestive enzymes, hormonal control of digestion, and liver function. High NEET weightage.

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Chyme entering the duodenum from the stomach is strongly acidic. Its pH is raised mainly by:

Concept context

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