Tear-gas chemicals (1)

When people are overly sad, they can cause parasympathetic nerve excitement, leading to lacrimal gland secretion of tears, called sad tears, which tastes salty; excessive happiness can cause sympathetic nerve excitement and stimulate lacrimal gland vasoconstriction, leading to tearing, called happy tears, with a light taste; sad tears and happy tears are collectively called Emotional tears

Another important reason for human tears is the self-protection response caused by the elimination of foreign bodies or diluting stimuli.

All chemicals that have a stimulating effect on the ocular mucosa and the retina have a tearing effect

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In order to defend their own interests, certain animals and plants often release chemicals that can irritate the mucous membranes and skin of the invader or cause pain in the eyes of the invader in an emergency

When peppers are cut, peeled and ground, capsaicin (OC) is released , which is a kind of defensive function of the plant to protect itself and its descendants

In human society, the tear gas is widely used by police around the world, and its tear gas is mainly composed of acetophenone (CN), o-chlorobenzylidene malononitrile (CS), and capsaicin (OC) in a certain proportion

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