Tears

lacrimationteartear filmtearinglachrymationteardroplachrymatoryDespondencytear productionwatery eyes
[[File:Tear system.svg|250px|thumb|Anatomy of lacrimation, showing a) Lacrimal glandwikipedia
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Lactoferrin

lactotransferrinRecombinant human lactoferrin
Lactoferrin is a globular glycoprotein with a molecular mass of about 80 kDa that is widely represented in various secretory fluids, such as milk, saliva, tears, and nasal secretions.

Lacritin

lacrimal functional unit
Lacritin is a secreted protein found in tears and saliva.

Eye drop

eye dropseyedropsophthalmic
Special eye drops are available for contact lens wearers.
Eye drops sometimes do not have medications in them and are only lubricating and tear-replacing solutions.

Meibomian gland

meibomian glandsmeibomian gland dysfunctiontarsal glands
The Meibomian gland (often written with a small "m" and also called tarsal gland) is a holocrine type of exocrine gland, at the rim of the eyelid inside the tarsal plate, responsible for the supply of meibum, an oily substance that prevents evaporation of the eye's tear film.

Lysozyme

muramidaselysozymeshuman milk ysozyme
Mainly, tears are composed of water, salts, antibodies and lysozymes (antibacterial enzymes).
Lysozyme is abundant in secretions including tears, saliva, human milk, and mucus.

Lacrimal lake

lacus lacrimalis
Lacrimal fluid gathers in the lacrimal lake, and is drawn into the puncta by capillary action, then flows through the lacrimal canaliculi at the inner corner of the eyelids entering the lacrimal sac, then on to the nasolacrimal duct, and finally into the nasal cavity.
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). The volume of the lacrimal lake has been estimated to be between 7 and 10 µL.

Yawn

yawningyawnsPandiculation
Laughing or yawning may also lead to the production of tears.
Anecdotal reports by users of psilocybin mushrooms often describe a marked stimulation of yawning while inebriated, often associated with excess lacrimation (eyes producing tears) and nasal mucosal stimulation, especially while "peaking" (undergoing the most intense portion of the psilocybin experience).

Nasolacrimal duct

tear ducttear ductsduct
Lacrimal fluid gathers in the lacrimal lake, and is drawn into the puncta by capillary action, then flows through the lacrimal canaliculi at the inner corner of the eyelids entering the lacrimal sac, then on to the nasolacrimal duct, and finally into the nasal cavity. Obstruction of the punctum, nasolacrimal canal, or nasolacrimal duct can cause even normal levels of basal tear to overflow onto the face (epiphora), giving the appearance of constant psychic tearing.
The nasolacrimal duct (also called the tear duct) carries tears from the lacrimal sac of the eye into the nasal cavity.

Goblet cell

goblet cellsglandular epithelial cellsgoblet
In the conjunctiva goblet cells are a source of mucin in tears and they also secrete different types of mucins onto the ocular surface.

Tear gas

teargaslachrymatorlachrymatory agent
Tear gas, formally known as a lachrymator agent or lachrymator (from the Latin lacrima, meaning "tear"), sometimes colloquially known as mace, is a chemical weapon that causes severe eye and respiratory pain, skin irritation, bleeding, and even blindness.

Cornea

cornealcorneal diseasecorneal diseases
1) Corneal epithelium: an exceedingly thin multicellular epithelial tissue layer (non-keratinized stratified squamous epithelium) of fast-growing and easily regenerated cells, kept moist with tears. Irregularity or edema of the corneal epithelium disrupts the smoothness of the air/tear-film interface, the most significant component of the total refractive power of the eye, thereby reducing visual acuity. It is continuous with the conjunctival epithelium, and is composed of about 6 layers of cells which are shed constantly on the exposed layer and are regenerated by multiplication in the basal layer.

Immune system

immuneimmune responseimmune responses
The flushing action of tears and urine also mechanically expels pathogens, while mucus secreted by the respiratory and gastrointestinal tract serves to trap and entangle microorganisms.

Eye

eyesoculareyeball
Tearing, lacrimation, or lachrymation is the secretion of tears, a body fluid which often serves to clean and lubricate the eyes in response to an irritation of the eyes.
Tears

Parasympathetic nervous system

parasympatheticparasympathetic nerveparasympathetic nerves
The parasympathetic system is responsible for stimulation of "rest-and-digest" or "feed and breed" activities that occur when the body is at rest, especially after eating, including sexual arousal, salivation, lacrimation (tears), urination, digestion and defecation.

Crying

cryweepingcried
Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, love, awe, and pleasure. "Crocodile tears syndrome", also known as Bogorad's syndrome, is an uncommon consequence of nerve regeneration subsequent to Bell's palsy or other damage to the facial nerve in which efferent fibers from the superior salivary nucleus become improperly connected to nerve axons projecting to the lacrimal glands, causing one to shed tears (lacrimate) during salivation while smelling foods or eating.
Crying is the shedding of tears (or welling of tears in the eyes) in response to an emotional state, pain or a physical irritation of the eye.

Lacrimal gland

lacrimal glandslacrimaltear glands
The lacrimal glands secrete lacrimal fluid, which flows through the main excretory ducts into the space between the eyeball and lids. "Crocodile tears syndrome", also known as Bogorad's syndrome, is an uncommon consequence of nerve regeneration subsequent to Bell's palsy or other damage to the facial nerve in which efferent fibers from the superior salivary nucleus become improperly connected to nerve axons projecting to the lacrimal glands, causing one to shed tears (lacrimate) during salivation while smelling foods or eating.
In human physiology, the lacrimal glands are paired, almond-shaped exocrine glands, one for each eye, that secrete the aqueous layer of the tear film.

Epiphora (medicine)

epiphoraexcess tearingExcessive tearing
Obstruction of the punctum, nasolacrimal canal, or nasolacrimal duct can cause even normal levels of basal tear to overflow onto the face (epiphora), giving the appearance of constant psychic tearing.
A clinical sign or condition that constitutes insufficient tear film drainage from the eyes in that tears will drain down the face rather than through the nasolacrimal system.

Onion

onionsonion (Allium cepa)bulbs
Freshly cut onions often cause a stinging sensation in the eyes of people nearby, and often uncontrollable tears.

Crocodile tears

crocodiles were thought to weepfalse tearfulnessfeigning emotion
"Crocodile tears syndrome", also known as Bogorad's syndrome, is an uncommon consequence of nerve regeneration subsequent to Bell's palsy or other damage to the facial nerve in which efferent fibers from the superior salivary nucleus become improperly connected to nerve axons projecting to the lacrimal glands, causing one to shed tears (lacrimate) during salivation while smelling foods or eating.
Bogorad's syndrome is a condition which causes sufferers to shed tears while consuming food, so has been labelled "crocodile tears syndrome" with reference to the legend.

Secretion

secretedsecretesecretory pathway
Tearing, lacrimation, or lachrymation is the secretion of tears, a body fluid which often serves to clean and lubricate the eyes in response to an irritation of the eyes.

Emotion

emotionsemotionalemotional state
Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, love, awe, and pleasure.

Sorrow (emotion)

sorrowdejectiondolorous
Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, love, awe, and pleasure.

Happiness

happyenjoymenthappier
Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, love, awe, and pleasure.

Love's Travel Stops & Country Stores

loveLove's Travel StopsLove's Travel Stop
Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, love, awe, and pleasure.

Awe

Tears formed through crying are associated with strong internal emotions, such as sorrow, elation, love, awe, and pleasure.