2. Tears

There are three types of tears, each with a different composition. When eyes become irritated by substances such as dust or onions, reflex tears flush the eyes. Emotional tears could be the result of laughter or sorrow, and basal tears keep the cornea lubricated. All tears include water, salts, antibodies, and enzymes that protect the eyes from bacteria. Additional components include a protein-based hormone that's a natural painkiller in emotional tears. Inadequate tearing causes dry eyes and requires drops.

tears body fluids RapidEye / Getty Images

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