Why do people shed tears when they are sad?

Tears are a kind of venting of emotions, boys may cry when they are extremely sad, and girls will often cry, even if it is because of some small things, feel bored, lonely, lonely, will, tears are a good kind of catharsis, after flowing feel released, relieve emotions together.

Tears are caused by emotional stress, and both joy and sadness contribute to the release of this chemical compound. The chemical composition of tears shed by cold air, wind, or cold is very different from that of tears when you are sad.

When a person is sad, he is in a bad mood, and the body secretes a very toxic hormone, and tears can eliminate these toxins, so a small number of tears can kill the guinea pig.

In fact, crying when you are sad is good for relieving your emotions and physical health.

Because the five senses are all the same, when we are extremely happy, we will also be tired. Happiness and sorrow.

Because it hurts.

I've been injured and tired. Crushed and tired.

If you have loved, you will cry.

There are a lot of excitatory nervous systems in the human brain.

When the mood changes dramatically (heartache) or (excitement), it will be transmitted to the eye capsule nervous system through the brain to open the lacrimal sac channel, so that tears can overflow.

Tears come from the lacrimal glands.

The lacrimal gland is made up of thin tubular glands and ducts, which are the organs that secrete tears. The lacrimal gland is located in the lacrimal gland fossa above the outer orbit and is divided into two parts: the upper part is the orbit, also called the upper lacrimal gland, which is larger and resembles an almond, about 12mm 20mm; The lower part is the eyelids, also called the inferior lacrimal glands, which are smaller.

The lacrimal gland has 10 12 excretory ducts, and the tear is excreted from these excretory ducts after it is produced. Under normal circumstances, the tear glands secrete tears during the day, which moisten the conjunctiva and cornea of the eyeball, and stop secreting tears when the person is sleeping.

Hello dear! We'd love to answer for you. People are not plants and trees, who can be ruthless, life will inevitably face joys and sorrows, and even after experiencing a lot of things, it will inevitably become sentimental, so when you are sad, you will shed tears, because of the unbearable pain in your heart, you will dispel your sad mood by crying and tears, which is actually a way to self-channel negative emotions.

Of course, dear, if you have a different point of view, you can communicate with me.

When a person is sad, the brain has certain functions, secreting hormones, synthesizing lysozyme in the lacrimal gland cells, secreting tears, and when people are sad, tears are normal. It's also a physiological reaction of human beings.