Why do you cry when you yawn? Please, 3Q

Who weeps when he yawns When he is sleepy, he always yawns. When you yawn, your eyes will always be full of tears, why do people shed tears when they yawn? Human tears are secreted all the time, flowing on the surface of the eyeball.

However, there is very little tears secreted and they flow along the surface of the eyeball and in the tiny spaces inside the eyelids, so you don't feel that the tears are flowing. However, in the blink of an eye, the tears on the surface of these eyeballs are sucked into the nasolacrimal duct, the sewer of the tears. Don't underestimate this not-so-long tube, it's the only way for tears to reach your nose.

The lacrimal glands constantly secrete tears, and the nasolacrimal ducts constantly excrete tears, so people usually do not shed tears. When a person yawns, his mouth is wide open, and he may exhale more than he can out of his body in order to exhale carbon dioxide and inhale oxygen. With the action of yawning, a stream of gas exhales forcefully from the mouth.

The muscles of the cheeks, tongue and throat tense and contract, and the pressure in the mouth and nose increases. As a result of the increased pressure in the nasal cavity, it will temporarily block the work of the nasolacrimal duct to excrete tears, and the "sewer" will not be passed, and the tears will not flow, and more and more tears will accumulate in the eyes. There will be tears in his eyes, and finally he will burst out of his eyes and flow to his face.

In fact, not only yawning can cause tears, but also when people laugh, sneeze, cough, and vomit, and the reason is the same.

We yawn when we are very tired, very tired, or sleep deprived, and every time we yawn, we are in tears, why do people shed tears when we yawn?

Why do people shed tears when they yawn? Star Awareness Project

Yawning and tears are normal physiological phenomena of the human body, the principle is that in the process of yawning, the mouth is opened very wide, the nasolacrimal duct is blocked, and tears cannot flow into the nasal cavity, but overflow from the eyes, so there will be yawning accompanied by tears.

Tears are not secreted only when crying, they are secreted all the time, and yawning causes the muscles of the face and throat to contract, causing the pressure in the nasal cavity to increase, the tears stop being excreted, and the tears accumulate in the eye sockets and then flow down.

Cause analysis. Yawning causes muscle tension and contraction in the face, tongue, and throat, causing increased pressure in the nasal cavity, and the nasolacrimal duct stops the excretion of tears, causing tears to accumulate in the eye sockets and then flow down.

Initiatives are proposed. Yawning can be a sign of lack of oxygen and sleepiness in the brain, and is used to indicate that the brain is very tired and needs to rest. Therefore, when this happens, it is best to go to rest immediately and make up for sleep. Usually exercise more and develop the habit of going to bed early and waking up early.

When you yawn, your eyes will tear because your eye muscles compress the tear glands in your eyes.

Because when you yawn, the movement of your face compresses the tear ducts, so you always have tears when you yawn.

Why do people shed tears when they yawn? Star Awareness Project

Usually during sleep, the tear gland will secrete tears to lubricate the eyeballs and rest, and tears when yawning are the brain's reminder that it is time to sleep, and tears are a reminder at this time, just like the stomach will bark when you are hungry.