Tears are needed to moisturize the surface of the cornea, wash away dirt from it, and to protect against bacteria. Tears contain lysozyme, a substance with antimicrobial properties.
Tears are produced in the lacrimal glands, from which 5 to 12 tubules open in the outer corner of the eye. After moistening the surface of the eyeball, tears flow to the inner corner of the eye (to the nose.} Here, salty droplets are collected in the lacrimal sac, and from it they are sent along the nasolacrimal canal into the nasal cavity or flow down the cheeks.
A person produces 1-3 ml of tears per day, and when he cries, as they say, tears flow in a stream. In a lifetime, a person sheds 65 liters of tears.