tear

Also known as tears, tearing, tear fluid

AI overview

Tears are a clear fluid produced by glands in the eyes of all land mammals, made up of water, electrolytes, proteins, lipids, and mucins that coat the eye's surface. They come in four different types—basal, closed eye, emotional, and reflex—each with distinct compositions, and their production can increase dramatically in response to irritation.

AI-generated from the Wikipedia summary — may contain errors.

Research

83,190 papers

Influence of pelvic floor muscle training alone or as part of a general physical activity program during pregnancy on urinary incontinence, episiotomy and third- or fourth-degree perineal tear: Systematic review and meta-analysis of randomized clinical trials.Acta obstetricia et gynecologica Scandinavica · 2024Zhang D, Bo K, Montejo R et al.DOI: 10.1111/aogs.14744
Perineal tears - A review.ReviewAustralian journal of general practice · 2018Goh R, Goh D, Ellepola HDOI: 10.31128/AFP-09-17-4333
Tear propagation in vaginal tissue under inflation.Acta biomaterialia · 2021McGuire JA, Monclova JL, Coariti ACS et al.DOI: 10.1016/j.actbio.2021.03.065
Treatment of Degenerative Meniscus Tears.Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association · 2023Hohmann EDOI: 10.1016/j.arthro.2022.12.002
Patient Outcomes After Horizontal Cleavage Tear Repair: A Systematic Review.Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association · 2020Morris JH, Magnussen RA, DiBartola AC et al.DOI: 10.1016/j.arthro.2020.04.027
The International Skin Tear Advisory Panel: 10 Years in the Making.ReviewAdvances in skin & wound care · 2019LeBlanc KDOI: 10.1097/01.ASW.0000604188.00448.65
Rehabilitation protocols following rotator cuff repair: a meta-analysis of current evidence.ANZ journal of surgery · 2021Bandara U, An VVG, Imani S et al.DOI: 10.1111/ans.17213
Evaluation of ocular surface and tear function - A review of current approaches for dry eye.ReviewIndian journal of ophthalmology · 2022Koh S, Rao SK, Srinivas SP et al.DOI: 10.4103/ijo.IJO_1804_21

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Wikidata facts

Image: Mary Magdalene Crying Statue.jpg

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Commons category: Tears
Commons gallery: Tears
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Sources (4)

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~15 min read

Article

15 sections

Contents

Physiology
Chemical composition
Drainage of tear film
Types
Nictitating membrane
Neurology
Human culture
Pathology
Bogorad's syndrome
Keratoconjunctivitis sicca ([[Dry eye syndrome|dry eye disease]])
Familial dysautonomia
Pseudobulbar affect
See also
References
External links

thumb|upright=1.15|Human tears Tears (tear film) are a transparent fluid secreted primarily by the lacrimal glands (tear gland) found in the eyes of all land mammals. According to the mode of production, tears are classified into four types: basal, closed eye, emotional, and reflex. The basal rate of tear secretion is ~0.5–2.2 μL/min, and irritation can increase secretion by up to ~100-fold, reaching ~300 μL/min. Tears are made up of water, electrolytes, proteins, lipids, and mucins that form layers on the surface of eyes. The four types of tears differ significantly in their composition. upright=1.15|thumb|Anatomy of lachrymation, showing Some of the functions of tears include lubricating the eyes (basal tears), removing irritants (reflex tears), and also aiding the immune system. Tears also occur as a part of the body's natural pain response. Emotional secretion of tears may serve a biological function by excreting stress-inducing hormones built up through times of emotional distress. Tears have symbolic significance among humans.

== Physiology ==