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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.
Function: The Tear Apparatus. Tears are produced by the lacrimal (tear) glands, which are situated above each eyeball. The glands continually secrete a small amount of salty fluid that is distributed over the surface of the eyes through the action of blinking and drain into the nose. Tears form a protective film that lubricates the eye and flushes out any dust and dirt. They also contain an antibacterial ingredient. Tear production increases when you cry or if the eye is irritated by a chemical or foreign particle.