JAMB Biology 2012 Objective — Question 17
Question 17 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2012 Objective paper, with the correct answer and a full explanation.
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A function of the hydrochloric acid produced in the human stomach during digestion is to
- A. neutralize the effect of bile
- B. coagulate milk protein and emulsify fats
- C. stop the action of ptyalinCorrect
- D. break up food into smaller particles
Explanation
The HCl produced in the stomach kills germs, provides an acidic environment for gastric enzymes, and neutralizes the alkalinity of saliva. Since the enzyme ptyalin present in saliva only works in an alkaline medium, once HCl neutralizes that alkalinity, the action of ptyalin is stopped.
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