Question

Lactic acid is present in:
A.Tears
B.Nasal secretion
C.Saliva
D.Sweat

Answer 1

Hint: We can say organic acid as an organic compound that exhibits acidic properties. Certain of the common organic acids are carboxylic acids, sulfonic acids. Organic compounds in biological systems containing the presence of organic groups are called organic acids. Lactic acid, uric acid, malic acid, acetic acid are some of the general examples of organic acids.

Complete answer:
We have to remember that a chemical byproduct of anaerobic respiration is lactic acid. In yogurt and our guts, bacteria produce lactic acid. It is also present in our blood. Muscles and red blood cells deposit lactic acid in the blood. The chemical formula of lactic acid is $C{H_3}CH\left( {OH} \right)COOH$ and its IUPAC name is 2-hydroxypropanoic acid. Salts of lactic acid are known as lactates. The products of fermentation in some bacteria are lactates.
We have to know that a waste product of metabolism is lactic acid. Sweat excretes lactic acid. A solution that contains several chemicals found is blood including lactic acid is sweat. Therefore, the option (D) is correct.
We have to remember that the acid present in tears is Sialic acid. Therefore, the option (A) is incorrect.
We must know that the nasal mucus contains aspartic acids. Therefore, the option (B) is incorrect.
As we know that there is no acid present in salvia. Therefore, the option (C) is incorrect.
Therefore, the option (D) is correct.

Note:We have to remember that lactic acid is a colorless and a crystalline substance. Lactic acid is miscible with water. As we know that the milk fermentation produces lactic acid. Lactic acid is present in sour products of milks such as yoghurt, curd, cottage cheeses, kefir, and Laban. It is also found in products such as meat and beer. We can use lactic acid as flavouring agents, leather tanning, and dyeing wool.