Multiple choice

In humans, the pH of saliva varies from

  1. 8.0 to 10.0

  2. 7.5 to 8.0

  3. 7.5 to 9.0

  4. 6.7 to 7.2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 In humans, the pH of saliva varies from 6.7 to 7.2.The main enzyme in saliva (amylase, which breaks down starch) cannot function in an environment lower than a pH of 6.5. So, pH in this range is needed to promote mineral absorption and starch digestion.

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