Question

With reference to a normal human being, which one of the following statements is not correct?

• A. Human saliva is approximately neutral.
• B. An adult human may secrete $1$ to $1.5$ litres of saliva per day.
• C. Saliva is secreted by six pairs of salivary glands in human beings.
• D. The salivary enzyme (ptyalin) breaks down cooked starch into maltose.

Answer 1

The correct option is C Saliva is secreted by six pairs of salivary glands in human beings.

• Salivary glands open into the buccal cavity.
• There are 3 pairs of salivary glands, viz., sublingual glands below the tongue, submandibular gland below lower jaw andparotid gland in front of the ear.
• The salivary glands have two types of cells namely serous and mucous.
• Serous produce a digestive enzyme salivary amylase or ptyalin. Mucous cells produce mucous.
• Thus, the correct answer is option C.