Why people cry? All truth about tears of
“Any person, except you, does not deserve yours got down, and those who deserve do not force you to cry“ . Yes will forgive me to Gabrielle Marques for rephrasing...
Why people cry? From pain, offense, a grief, for pleasure, happiness, delight. The reasons to wash the soul tears a big set, both physiological, and emotional. Ability to cry is one of ways to express the feelings. In the course of natural selection only the one who was able to cry survived.
As it is strange, we are not born with such ability. Shout is not always followed by tears. Kids begin to cry only on 5 - 12 week after the birth, it is a little before that time when in their arsenal the laughter appears. The average duration of crying - 6 minutes. Children cry more often than adults, about 65 times a month.
Daily small plaintive glands allocate about 1 ml of plaintive liquid. Each teardrop has very complex structure. It consists of the slime covered with a sheet of water, a layer of the oily substance consisting of lipids and other fats (amides of fatty acids). The tear contains table salt (sodium chloride), the chloride of potassium and substance which are taking part in process of formation of salts (calcium, two-carbonic sodium, manganese). There is as a part of a tear one more special substance - lizotsy, its existence also explains bactericidal properties.
Blinking, an upper eyelid as if janitors of a windshield, distributes a tear on a forward surface of an eye from an upper eyelid to a lower eyelid. On the way the teardrop moistens a cornea, washing away from it all superfluous and unnecessary. Then the tear moves ahead to the plaintive lake which is in an internal corner of an eye. From the lake on plaintive tubules the tear gets to a plaintive bag, and from it already in tearfully - the nasal channel and in a nasal sink where it is partially soaked up by a mucous membrane and partially evaporates.
In some cases the main plaintive gland gets into gear, and there are tears in large numbers which it is visible with the naked eye and it is possible “to collect“ by make-shifts.
Besides protective function, the tear supplies a cornea with nutrients, in parallel there takes place gas exchange between air and a cornea, and sight because teardrops fill the minor defects of a surface of a cornea improves.
On a surface of an eye the thin film which does not grow turbid is formed and does not allow evaporation.
What do tears? Reduce stress and weaken emotions. Besides, tears bring toxic substances out of our organism, normalize a blood pressure, increase immunity and even promote healing of injuries - such here peculiar therapeutic effect. There is also other advantage: exactly thanks to tears skin around eyes so gentle and long remains young. Then that is useful to cry very much even.
Tears happen different - reflex, irritation tears (at inhalation something, for example, an onions smell) and emotional (after viewing of movies, reading of books). On the structure they differ. Emotional tears contain more protein therefore after such tears it becomes easier, there comes the psychological discharge.
Not only people are able to cry. Some animals have reflex tears necessary for clarification and moistening of eyes too, it concerns those who live on the land. They, as well as the person, are subject to negative impact of world around. To inhabitants of water space tears are not provided by the nature. And “crocodile tears“ are at all and not tears, but the secret allocated by salivary glands of a crocodile.