What is the difference between snot and tears Is snot real tears

Because the human eyes, nasal cavity and throat are connected, the nerves around the eyes will be stressed while wiping the nose, so tears will flow, which is a normal phenomenon, in scientific terms, it is due to the edema or complete closure of the nasal cavity, but the eye to secrete some moist fluid, through the nasolacrimal duct to the nasal cavity, but the nasal cavity is closed, so it can only flow out of the eye.

Because the seven orifices of the person are connected, the entire upper respiratory tract of the person will be common to each other, when blowing the nose, the nose will be blocked, in order to ensure normal breathing, a part of the liquid will flow out of the eyes, reducing the situation of the nose blockage; To explain the situation scientifically, in order to ensure the balance of the entire upper respiratory tract, the fluid will be diverted, and the eyes will have tears.

Because it takes a certain amount of strength to blow your nose, it is easy to drive the secretion of some tear glands when wiping your nose, so it is easy to shed tears.

There are lacrimal glands on the outside of the eyeball, and the fluid that is secreted is tears. Tears are made from blood and processed from the lacrimal glands. After the tears are drained from the lacrimal glands, they enter the lacrimal sac, which is located within the conjunctiva.

It is then drained into the tear ducts. Tears are 99% water, but also contain salts, lysozyme that can dissolve bacteria, a small amount of protein, immunoglobulin A, etc. Under normal circumstances, the amount of tear secretion is generally sufficient to moisten the conjunctival and corneal surfaces to prevent dryness.

If the lacrimal gland produces too much tears, which exceeds the normal discharge of the tear duct, runs out of the eye socket and flows to the cheeks, it is called tearing. In addition to moistening the cornea and conjunctiva to prevent dryness, tears also have disinfecting and sterilizing effects.

When tears flow into the mouth, the person will feel a salty taste. Why are tears salty?

Scientists used the method of microanalysis to find that in people's tears, 99 is water, 1 is solid, and more than half of this solid is salt, no wonder it has a salty taste! It turns out that there is a gland the size of a little finger on the outer top of the eyeball, called the lacrimal gland, which is made of blood as raw material and processed to produce tears. And we know that in the blood, body fluids and tissue fluids of the human body contain salt, it is not surprising that there is salt in tears made of blood.

Salt accounts for 0 9 in blood and 0 6 in tears. Tears contain not only salt, but also enzymes that dissolve bacteria, which have a bactericidal and slightly disinfecting effect on the eyes. In addition, the surface of the black eye is often coated with a thin layer of tears, which can moisten the cornea so that it does not dry out and cloudy due to direct exposure to the air.

Sweat and snot are much the same.

Problem analysis: There is a nasolacrimal duct in the eye, which leads to the nasal cavity, and when there are tears, it flows into the nasal cavity through the nasolacrimal canal.

Suggestions: Stupid Tan Chun.

The tears that flow into the nasal cavity naturally flow through the nose and are resistant to the outside of the body, so there is a saying that there is a handful of tears and a handful of snot.