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Human tears. 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]
Crying is the dropping of tears (or welling of tears in the eyes) in response to an emotional state or physical pain. Emotions that can lead to crying include sadness , anger , joy , and fear . Crying can also be caused by relief from a period of stress or anxiety , or as an empathetic response.
In nature, similar structures are produced under certain conditions in volcanic lava and are known as Pele's tears. The drops are named after Prince Rupert of the Rhine , who brought them to England in 1660, although they were reportedly being produced in the Netherlands earlier in the 17th century and had probably been known to glassmakers for ...
Excess tears flow through the nasolacrimal duct which drains into the inferior nasal meatus. This is the reason the nose starts to run when a person is crying or has watery eyes from an allergy, and why one can sometimes taste eye drops. This is for the same reason when applying some eye drops it is often advised to close the nasolacrimal duct ...
Tear gas in use in France 2007 Exploded tear gas canister in the air in Greece. Tear gas, also known as a lachrymatory agent or lachrymator (from Latin lacrima 'tear'), sometimes colloquially known as "mace" after the early commercial self-defense spray, is a chemical weapon that stimulates the nerves of the lacrimal gland in the eye to produce tears.
The lacrimal lake is the pool of tears in the lower conjunctival cul-de-sac, which drains into the opening of the tear drainage system (the puncta lacrimalia). [1] The volume of the lacrimal lake has been estimated to be between 7 and 10 μL.
Crocodile tears, or superficial sympathy, is a colloquial term used to describe a false, insincere display of emotion, such as a hypocrite crying fake tears of grief. The phrase derives from an ancient belief that crocodiles shed tears while consuming their prey and, as such, is present in many modern languages, especially in Europe, where it ...
A Lacrymatory, at the Beja museum in Portugal.. A lacrymatory, lachrymatory or lacrimarium (from the Latin lacrima, 'tear') is a small vessel of terracotta or, more frequently, of glass, found in Roman and late Greek tombs, and formerly supposed to have been bottles into which mourners dropped their tears.