How is the required ph level maintained in the stomach and small intestine

The pH of gastric acid is 1.35 to 3.5 in the human stomach, the acidity being maintained by the proton pump H+/K+ ATPase. The small intestine has a pH of around 7 to 8, that is, it is either neutral or slightly alkaline in nature. The pancreas secretes the bicarbonate ions through bile juice in the small intestines.

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