If you have tears, shed them now,mechanism , science of of tears

Tears flow when in physical pain,eyes are irritated or when in mental stress.

Tears have anti-bacterial properties that ward off infection.When eyes are irritated they flow to expel the foreign object out.

Under Physical pain, the tears flow, triggered by the secretion of Adrenalin(or is it the other way?) as a Defense mechanism.It conveys the Universal message of  ‘I am under pain,please understand/help’.

It also helps to reduce mental strain.

Shedding tears , we have been told since time immemorial, is not manly.Wrong.It is natural for men as well. Nothing wrong in crying under strain.

Story:Emotional crying is a universal, uniquely human behavior. When we cry, we clearly send all sorts of emotional signals. In aWeizmann Institute have demonstrated that some of these signals paper published online today in Science Express, scientists at the are chemically encoded in the tears themselves. Specifically, they found that merely sniffing a woman’s tears – even when the crying woman is not present — reduces sexual arousal in men.

This undated handout photo provided by the journal Science shows a donor woman watching sad films in isolation, using a mirror to capture tears into a vial. If a crying woman’s red nose isn’t a big enough turnoff to a man, a surprising experiment found another reason: Tears of sadness may temporarily lower his testosterone level. (AP Photo/Science)

Human emotional crying was especially puzzling to Charles Darwin, who identified functional antecedents to most emotional displays — for example, the tightening of the mouth in disgust, which he thought originated as a response to tasting spoiled food. But the original purpose of emotional tears eluded him. The current study has offered an answer to this riddle: Tears may serve as a chemosignal. Sobel points out that some rodent tears are known to contain such chemical signals. “The uniquely human behavior of emotional tearing may not be so uniquely human after all,”