Optimum pH for action of pepsin and salivary amylase is
Correct answer: B. 1.8 and 6.8 respectively
- A. 3.5 and 7.7 respectively
- B. 1.8 and 6.8 respectively
- C. 6.8 and 7.4 respectively
- D. 1.8 and 7.4 respectively
Explanation
The stomach has a pH between 1.5 and 3.5 generally and this is due to the cells in the stomach releasing hydrochloric acid, this is where pepsin is present, so It has a low optimum pH of around 2, so options A and C are incorrect. Saliva has a pH normal range of 6.2-7.6 with 6.7 being the average pH, which means salivary Amylase should have an optimum pH around the same range. Amylase has an optimal pH between 6.4 and 7.0
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