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Question

With reference to a normal human being, which one of the following statements is not correct?
  1. Human saliva is highly acidic.
  2. An adult human may secrete 1 to 1.5 litres of saliva per day.
  3. Saliva is secreted by 3 pairs of salivary glands in human beings.
  4. The salivary enzymes(ptyalin) breaks down cooked starch into maltose.

A
The salivary enzymes(ptyalin) breaks down cooked starch into maltose.
B
An adult human may secrete 1 to 1.5 litres of saliva per day.
C
Human saliva is highly acidic.
D
Saliva is secreted by 3 pairs of salivary glands in human beings.
Solution
Verified by Toppr

  • Saliva has a pH normal range of 6.2-7.6 with 6.7 being the average pH. Saliva is a dilute fluid over 99% being made up of water. Hence, it cannot be considered highly acidic but slightly acidic.
  • Saliva is secreted by 3 pairs of salivary glands (the parotid, the submandibular, and the sublingual glands) in human beings.
  • An adult human may secrete 1 to 1.5 litres of saliva per day.
  • Digestion of starch starts in the mouth by the salivary enzymes (ptyalin) which breaks down cooked starch into maltose.
So, option A is the correct answer.

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