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Which of the following is correct about salivation? 

Option: 1

Saliva is hypotonic with extra cellular fluid.

Option: 2

Saliva is more concentrated than extra cellular fluid.

Option: 3

Salivary glands are endocrine glands .

Option: 4

All of the above

Answers (1)


Saliva gland acinar cells are chloride and sodium secreting, and the isotonic fluid produced is rendered hypotonic by salivary gland duct cells as it flows to the mouth. The major proteins present in saliva are secreted by salivary glands, creating viscoelasticity and enabling the coating of oral surfaces with saliva.  hence option A is correct and option B is incorrect.

The salivary glands are exocrine glands that make, modify and secrete saliva into the oral cavity. They are divided into two main types: the major salivary glands, which include the parotid, submandibular and sublingual glands, and the minor salivary glands, which line the mucosa of the upper aerodigestive tract and the overwhelming entirety of the mouth. hence option C is incorrect.

Saliva is hypotonic with extracellular fluid which is a correct statement. Hence, option 1 is the correct answer.

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Anam Khan

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