Tears vs. Urine: Composition and Origin
Tears (lacrimal fluid) are produced by the lacrimal glands (superolateral orbit) and accessory glands. Composition: water, electrolytes (Na⁺, K⁺, Cl⁻), proteins (lysozyme, lactoferrin, lipocalin), lipids (meibomian glands), mucins (goblet cells). Functions: lubrication, antimicrobial, optical smoothing, nutrient delivery to avascular cornea.
Urine is produced by kidneys (filtration, reabsorption, secretion). Composition: water, urea, creatinine, uric acid, electrolytes, toxins. Functions: waste excretion, volume/osmolality/electrolyte/pH regulation.
Crying does not produce urine. Different glands, different functions, different compositions. Emotional tears have higher protein/hormone content (prolactin, ACTH, leucine enkephalin) vs. basal/reflex tears.
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