Why are tears salty?
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Answer:
It's no accident that tears taste like the sweat that runs down our face on a hot day. Our flowing blood is salty, too. In fact, about 55 percent of the salt in the body is dissolved in fluids outside our cells, like blood plasma. ... Sodium, chloride and potassium are our body's major electrolytes.
Body fluids like sweat and tears are salty to taste and this has physiological, immunological and evolutionary significance. Tears are the secretions of lacrymal glands of eyes. These tears are classified into basal, reflex and psychic tears. The salinity and chemical composition of tears vary from type to type and situation to situation. Basal tears are responsible for keeping the cornea of eye moist. Reflex tears are produced during eye irritation.