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We also cry when we are in pain and scared. This triggers a child's instinct: to attract attention, to evoke empathy; in general, this is a way of manipulating others (first the child manipulates his mother by crying, then others). Even when the crying person is alone with himself, crying appears as a reflex act to emotional shocks.
The main component of crying is appropriate facial expressions and a characteristic long cry (so that the mother sees and hears that something is wrong with the baby). Also, when crying, breathing becomes faster (sobbing appears) – increased oxygen saturation of the body reduces the feeling of pain and stress.�
Tears are a byproduct of crying. When the circular muscles of the eyes contract, the pressure in the eye vessels increases significantly. That's why everyone who cries has red eyes. If nothing is done, the blood vessels will greatly expand and may burst (in the eyes they are thin). To do this, a protective mechanism has been formed – the pressure is relieved with the help of lacrimal glands – through them, excess fluid is removed from the vessels in the form of tears.