What acid is produced in the stomach?

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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

What acid is produced in the stomach?

Explanation:
In the stomach, the acid produced is hydrochloric acid as part of gastric juice. This strong acid creates a very acidic environment (pH around 1–3) that helps denature proteins and, more importantly, activates pepsinogen into the enzyme pepsin, which begins the digestion of proteins. The acidity also helps kill many ingested microbes, protecting the body. The other acids listed aren’t produced in the stomach: lactic acid comes from anaerobic metabolism or fermentation in muscles and some bacteria, acetic acid comes from fermentation in foods like vinegar, and nitric acid isn’t produced by the body in the digestive system. So, hydrochloric acid is the acid produced in the stomach.

In the stomach, the acid produced is hydrochloric acid as part of gastric juice. This strong acid creates a very acidic environment (pH around 1–3) that helps denature proteins and, more importantly, activates pepsinogen into the enzyme pepsin, which begins the digestion of proteins. The acidity also helps kill many ingested microbes, protecting the body. The other acids listed aren’t produced in the stomach: lactic acid comes from anaerobic metabolism or fermentation in muscles and some bacteria, acetic acid comes from fermentation in foods like vinegar, and nitric acid isn’t produced by the body in the digestive system. So, hydrochloric acid is the acid produced in the stomach.

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