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  4. Which of the following is not a component of saliva?

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Q. Which of the following is not a component of saliva?

NTA AbhyasNTA Abhyas 2020Digestion and Absorption

Solution:

Saliva is a watery substance located in the mouths of animals, secreted by the salivary glands. Human saliva is 99.5% water, while the other 0.5% consists of electrolytes, mucus, glycoproteins, enzymes, and antibacterial compounds such as secretory IgA and lysozyme. The enzymes found in saliva are essential in beginning the process of digestion of dietary starches and fats. These enzymes also play a role in breaking down food particles entrapped within dental crevices, protecting teeth from bacterial decay. Antibodies IgM is not present in saliva.