Question about tears?

Question

How are tears formed? What are they made of where are they stored untill we need them why are they salty? Please give me general informtion about them

Answer 1

Above each eye is a tear gland (lacrimal gland) at the far ends of the eyes and can be seen if you evert the eyelid,with ducts that carry the tears to the surface of the conjuctiva(protective layer on the surface of eye). Blinking spreads the tears downwards across each eyeball. Tears contain salts, mucus, antibodies and an enzyme called lysozyme which kills bacteria. they keep the surface of the conjunctiva moist, wash away dust and other particles and help prevent bacterial infection. Tears normally evaporate, but any excess is drained away through a duct that opens at the corner of the eye next to the nose and carries the fluid to the nasal cavity. thus when tears are produced in large quantities for example when a person cries or when the eye is irritated, it is often necessary to blow the nose. if you look closely you can see this hole at the nasal corner of the eye.

Answer 2

Tears flow from tear glands into your eyes through tiny tear ducts. The tear glands are located under your upper lids, and when stimulated, produce tears to form a thin film over your eyeballs. Every time you blink the film spreads over your eyes to keep them moist and free of dust and other irritants. Whether you are awake or asleep, happy or sad, this salty fluid is always flowing from the tear glands.It has nacl so it tastes salty ilke sweat yrine etc . it also has lysozyme which gives protection against some bacterias.

Although most land mammals have a lacrimation system to keep their eyes moist, humans are the only mammal generally accepted to cry emotional tears