[Answer] What is not included in the composition of tears?

Step 1 : Introduction to the question " What is not included in the composition of tears? "

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Tears are a clear liquid secreted by the lacrimal glands (tear gland) found in the eyes of all land mammals (except for goats and rabbits). Their functions include lubricating the eyes (basal tears), removing irritants (reflex tears), and aiding the immune system.

Tears are composed of water, salts, antibodies, and lysozymes (antibacterial enzymes), though composition varies among different tear types. The composition of tears caused by emotion differs from that of tears as a reaction to irritants, such as onion fumes, dust, or allergy. Emotional tears contain higher concentrations of stress hormones such as adrenocorticotropic hormone and leucine enkephalin (a natural pain killer), which suggests that emotional tears play a biological role in balancing stress hormone levels.

More Info: en.wikipedia.org

Step 2 : Answer to the question " What is not included in the composition of tears? "

Water:

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