Keyword Analysis & Research: tears

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What are tears made of and why do they happen?

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.

How do we produce tears?

The human body produces tears by stimulating two glands situated above each eye, behind the upper eyelids. These lacrimal glands are responsible for excreting lacrimal fluid, the medical term for tears.

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