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Tears are a transparent liquid produced by the lacrimal glands (tear glands) in all land animals’ eyes (except for goats and rabbits). They help the immune system by lubricating the eyes (basal tears), eliminating irritants (reflex tears), and lubricating the eyes (reflex tears). Tears are also a normal aspect of the body’s pain reaction. Humans are the only mammals known to cry in reaction to an emotional event, such as joy or despair. Tears have a symbolic meaning for people (see crying). Emotional tears may have a biological purpose by excreting stress-inducing chemicals that have accumulated during periods of emotional anguish. Water, electrolytes, proteins, lipids, and mucins create layers on the surface of the eyes in tears. The makeup of distinct types of tears”basal, reflex, and emotional”varies greatly.

There are three layers to tears: lipid, aqueous, and mucous. Water, salts, antibodies, and lysozymes (antibacterial enzymes) make up tears, albeit the content changes depending on the tear type. Tears produced in response to irritants such as onion odors, dust, or allergies have a different makeup than tears produced in response to irritants. Emotional tears include greater quantities of stress hormones such adrenocorticotropic hormone and leucine enkephalin (a natural pain reliever), implying that emotional tears have a biological function in stress hormone balance.

Amino Acids (1-Methylhistidine/3-Methylhistidine, Arginine, Asymmetric, Asymmetric dimethylarginine/Symmetric dimethylarginine, Citrulline, Creatine, Glutamine, Homoarginine, Hydroxyproline, Phenylalanine, Proline, Pyroglutamic acid, Serine, Taurine, Theonine, Tyrosine, Tyrosine, Urocanic (e.g., antibodies, lipocalin, lactoferrin, lysozyme, and lacritin)

Lacrimal fluid is secreted by the lacrimal glands and flows into the area between the eyeball and the lids via the primary excretory channels. The lacrimal fluid is dispersed across the surface of the eye as the eyes blink. The lacrimal lake, located in the medial area of the eye, collects lacrimal fluid. The lacrimal papilla is a raised area on the inner side of the eyelid, near the lacrimal lake’s margin. The canaliculi of the lacrimal glands enter into the papilla. The lacrimal punctum is the aperture of each canaliculus. Tears will enter the lacrimal sac from the punctum, then the nasolacrimal duct, and ultimately the nasal cavity. The nose might flow if there are too many tears, which can be induced by powerful emotions. The stability of the tear film has an impact on visual quality.