Why do people cry when they are sad, and what do tears represent?

Either you are happy with each other ... No tears can flow.

Either lose interest in each other.

Then separate is best.

I want to vent all the unhappiness in my heart, and tears are also part of expressing feelings.

Be friends with her (him) first, talk to her and joke more. Waiting until you are both familiar with each other to say that you have feelings for her will generally not cause embarrassment at this time. Pay attention to the joke should not be too much, when dating, you should grasp the scale to wish you good luck, I am sincere and sincere, I hope to exchange for your affirmation.

Because tears are the water in the human brain, and only when all of them come out will one be awake. So don't hold back when you're sad.

Because tears can blur your vision, so you can't see sad things clearly.

The transmission of excitation between one neurogen and another neurogen in the human body is accomplished by a mediator ——— a central transmitter. If there is too much of this central transmitter, it can cause too many nerve impulses. To do this, the body needs to produce a corresponding decomposition enzyme to dissolve the excess central transmitters.

Once there are too many central transmitters, the decomposition enzymes cannot remove all the nutrients, so they have to rely on tears to excrete them from the body.

This is human instinct, just like shit and fart.

The real sadness comes from the heart, but it can't be resolved, and there are no tears to cry.

Joy, anger and sorrow, people are more emotional.

No tears, no tear scratches, how to prove sadness....

When tears suddenly welled up, I thought: Why do people cry?

Primates, humans are the only ones who shed tears. Charles Darwin, the founder of the theory of evolution, once speculated that tears were the relics of some kind of evolution...

When crying, the microvessels around the eyes become congested, and at the same time, the small muscles contract to protect the eyes, causing the lacrimal glands to secrete tears... For the human body, tears are a by-product of no effect.

And the American anthropologist Montago has the exact opposite theory: human tears are the result of the survival of the fittest. Tears contain lysosomal bacteria, a self-defense substance that protects the nasopharyngeal mucosa from bacterial infection...

Then there were studies that divided tearing into reflex tears and emotional tears... The protein content of reflex tears is significantly lower than that of affective tears... This protein is a painkiller-like chemical...

Tearing is an act of excretion... It can eliminate the biochemical toxins caused and accumulated by the human body due to emotional stress... Restoring the mental and physiological balance of the weeping ...

Female ** tears are mostly emotional... The pain and sorrow of strangers cannot resonate suddenly ... That kind of feeling needs to be cultivated, just like watching movies and television, it needs to be sensational... Just as in the old days of crying and mourning, we talked while crying...

I think of some trivial things when we get along... No one goes home anymore ... No one checks whether the doors and windows are closed every night before going to bed...

No one cares about warmth and coldness anymore ... I also remembered some things that I didn't do well... Once impatient emotions ...

That's how I couldn't help but cry... It's a confession...

Resources.