Why do people shed tears when they are sad, instead of saliva, snot or something?

If a person's emotions are expressed by snot and saliva, it is too disgusting!

When you are sad and sad, your snot and saliva gush out, who will comfort you and feel sorry for you? It's nice not to vomit in front of you!

There is a nasolacrimal duct and nasal cavity in the left and right eyes, which communicates with the nasal cavity, and when a person has a large amount of tears, a part of the tears flow into the nasal cavity and flow out after mixing with the mucus secreted by the nasal mucosa, so the tears are always accompanied by a runny nose.

Tears are secreted by the lacrimal glands in the outer and upper reaches of the eye socket, and the tears themselves have the function of supplying corneal oxygen, eliminating waste, and keeping the eyes moist"Tears and snot"The reason is that when we are sad and cry, because a large number of tears flow into the nose through the tear ducts, it seems to follow the runny nose.

Why do you have a runny nose when you cry? The expert gave the answer, it turned out that it was caused by its entry into the nasal cavity.

People shed tears when they are sad, and everyone has times when they are sad, but have you noticed a strange phenomenon, that is, when we cry, we usually have a runny nose. This makes our image look so embarrassed and bad when we cry, but there is another interesting phenomenon, that is, we don't shed tears when we have a runny nose, why is that? Let's give you a detailed analysis.

First of all, we need to understand that there is a passage between the tears and the nasal cavity, and this passage is called the nasolacrimal duct inside our face. This nasolacrimal duct is a tube connecting the nose and the eyes, and this duct is extremely smooth, that is to say, when human beings cry, the moment our tears flow out of the eyes, in fact, some tears also flow into the nasal cavity through the nasolacrimal duct.

Finally, I would like to remind you that if you don't have a runny nose when you shed tears, then we should go to a regular hospital for a nasal examination. Check whether your nasolacrimal duct is unblocked, if the nasogastric duct is blocked, it is likely to cause nasal diseases or eye inflammation and other symptoms.

Because there is a passage between the nose and the eyes, when tears are shed, some of them will flow into the nasal cavity and form nasal discharge, and when the nose is runny, the water will not enter the eyes.

Because the nose is under the eyes, some of the tears may flow into the nose when there are tears, and the snot will not flow back into the eyes when the nose is runny.

The human eye and nasal cavity have a passage called the "nasolacrimal duct", and tears will flow when they pass through the nasal cavity, and the nasal mucus cannot be retained in the lacrimal glands.

When you cry, you will have a runny nose, because the nose and the eyes are connected, but if there is one place where there are tears, then the other place will also cry or runny nose together.

Because the lacrimal gland can be subjectively controlled by humans, nasal mucus cannot, people can cry when they want to, but they can't do cold without runny nose.

When you have tears, you will have a runny nose, and a runny nose will not have tears. Because the ophthalmic nerve is abundant, it is above the nose, which naturally affects the nose, and the nose cannot affect the eyes.

It's not snot, it's tears, because the lacrimal glands and the nasal cavity are connected, and when you cry, there are a lot of tears, and it will flow out of the nasal cavity