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Tears can be the result of our sorrow,
happiness or tiredness, but why are we crying at all?

In the video of “Ted Ed” – “Why we cry? Three Types of Tears, “Alex Gendler explains the physiology of tears, through the three classifications: basic, reflexive, and emotional tears.

 

Crying is inherent, and about 280 grams of tears are generated per day, and 132 kg per year. When it comes to gender, women tear more tears than men. According to a 2011 study published in the Journal of Research in Personality, women cry 5.3 times a month on average, while men 1.3 times. Researchers believe this is because women are biologically destined to throw out more tears, as tear glands in women are much smaller than those in men.

Regardless of sex, we practically cry every second of life and produce the same type of tears. The tongue, which is located in the outer upper part of the anterior cavity, continuously cures the antibacterial fluid rich in proteins. This fluid goes from the outer edge of the eye to the cornea and wet the entire surface of the eye, every time we blink.

Excessive fluid created during crying fills the exhaust channel through which tears pass, it spills out and falls over its cheeks. Base tears are always present in the eyes and serve to wet, protect and care of the eye.

The second type of tears, known as reflex tears, protects the eyes from irritants, such as wind, smoke or onions.

The third type of tears are those that are produced under the influence of emotions. Although these tears contain a higher level of stress hormones, they also directly calm the iris, while showing other people the emotional state.

We cry after we are born, until the last day of life, but scientists still do not exactly know how or why the tears are useful. They can also constitute a social mechanism to gain sympathy or show devotion.