Question

Which of the following is not a constituent of saliva?
A. Bicarbonate
B. Lysozyme
C. Glucose
D. Immunoglobulin

Answer 1

Hint: Whole saliva is made up of the secretions of the main and minor salivary glands, as well as the gingival crevicular fluid. Sympathetic and parasympathetic stimulations can cause saliva production. Saliva has a crucial function in the preservation and maintenance of oral tissue. Saliva is a multi-layered secretion. It is essential for the digestion of starch.

Complete answer:
Let us check the options with the composition of saliva to know the right answer. Basically saliva is \[00\% \] water and just \[1\% \] other things.
Option:A – Bicarbonates are present in saliva as a part of electrolytes
So, this option is incorrect because bicarbonates are constituents of saliva.
Option:B – Lysozyme is an integra part of saliva. It is part of the biochemical defense of the innate immune system. Lysozyme has antibacterial activities and with saliva it kills many bacterial pathogens by attacking their cell envelope.
Thus, this option is also not correct.
Option:C – Glucose is not present in saliva instead saliva contains amylase enzyme which breaks the starch in the food we eat to simpler fragments in the oral cavity initializing the process of digestion.
Thus, this option is correct as glucose is not the constituent of saliva.
Option:D – Saliva contains secretory immunoglobulins and IgA is a constituent of saliva.
Therefore, this option is also not correct.

Hence, Option C) Glucose is the correct answer.

Note:
Sodium, potassium, calcium, magnesium, bicarbonate, and phosphates are among the electrolytes found in saliva. Immunoglobulins, proteins, enzymes, mucins, and nitrogenous compounds including urea and ammonia are also present in saliva. Saliva's pH is balanced by bicarbonates. Salivary amylase is a starch-digesting enzyme that converts starch to dextrins.