State the pH nature of the contents of the stomach and the small intestine.

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Prepare for the Leaving Certificate Digestion Test with engaging questions and explanations. Ready yourself with multiple choice quizzes, hints, and deep insights. Be exam-ready now!

Multiple Choice

State the pH nature of the contents of the stomach and the small intestine.

Explanation:
Digestion involves a big pH shift along the gut. The stomach produces strong gastric acid, so its contents are very acidic, with a pH around 1–3. When chyme enters the small intestine, bicarbonate-rich secretions from the pancreas and bile neutralize the acid, raising the pH to roughly neutral/alkaline (about 7–8). This alkaline environment is essential for the enzymes in the intestine to work and to protect the intestinal lining. So the correct description is that the stomach contents are acidic and the small intestine contents are alkaline.

Digestion involves a big pH shift along the gut. The stomach produces strong gastric acid, so its contents are very acidic, with a pH around 1–3. When chyme enters the small intestine, bicarbonate-rich secretions from the pancreas and bile neutralize the acid, raising the pH to roughly neutral/alkaline (about 7–8). This alkaline environment is essential for the enzymes in the intestine to work and to protect the intestinal lining. So the correct description is that the stomach contents are acidic and the small intestine contents are alkaline.

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