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Tears
Clear liquid secreted from glands in eyes of mammals / From Wikipedia, the free encyclopedia
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Tears are a clear liquid secreted by the lacrimal glands (tear gland) found in the eyes of all land mammals.[1] Tears are made up of water, electrolytes, proteins, lipids, and mucins that form layers on the surface of eyes.[2] The different types of tears—basal, reflex, and emotional—vary significantly in composition.[2]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Tear_system.svg/640px-Tear_system.svg.png)
- a) Lacrimal gland
- b) Superior lacrimal punctum
- c) Superior lacrimal canal
- d) Lacrimal sac
- e) Inferior lacrimal punctum
- f) Inferior lacrimal canal
- g) Nasolacrimal canal
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The functions of tears include lubricating the eyes (basal tears), removing irritants (reflex tears), and also aiding the immune system.[3] Tears also occur as a part of the body's natural pain response.[4] Emotional secretion of tears may serve a biological function by excreting stress-inducing hormones built up through times of emotional distress.[5][6] Tears have symbolic significance among humans.[4]