Question 17
Animal NutritionA function of the hydrochloric acid produced in the human stomach during digestion is to
- A.neutralise the effect of bile
- B.coagulate milk protein and emulsify fats
- C.stop the action of ptyalin
- D.break up food into smaller particles.
Show the answer and explanation
Answer: C (stop the action of ptyalin)
Explanation
Ptyalin (salivary amylase) works only in neutral to slightly alkaline conditions; the acid in the stomach stops it working and gives pepsin the acid it needs.