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Tại sao thường nghe âm thanh nhỏ hơn hoặc không còn nghe thấy gì khi 'ngáp'?

Cập nhật: 01 thg 4, 2019 lúc tháng 3 31, 2019

Yawning is a common normal activity of the body, but sometimes you no longer feel the sound when yawning, do you feel that way? Let's find out why
Yawning is a very normal thing that most of us have experienced. Although sometimes it makes me quite ashamed as being in an important meeting or dating a lover ... Yawning is a very unique mechanism of action of the body, including humans and animals whenever sad. bored, sleepy ...

Why are we "yawning"?
Although there is no scientific explanation for this phenomenon, one of the hypotheses is that people often yawn when the body is bored and tired, we often have a lighter breath, which can easily lead to a situation. Oxygen deficiency for metabolic activities and cognitive maintenance, yawning to solve this problem helps us absorb more oxygen into the bloodstream and eliminate carbon dioxide out, as a larger breathing. It seems reasonable, but some other studies suggest that the absorption of more carbonic or oxygen does not cause yawning, they explain that this is a "stretching" activity, stretching tissues and cells in the lungs. That's why sometimes we stretch our bodies, stretch muscles and joints, we will yawn, as a way to increase our heart rate and become more alert.

Some other scholars argue that this is a substance redistribution activity, which helps the lungs to expand normally, according to this hypothesis if we don't yawn regularly, breathing deeply becomes difficult because the lungs will be reduced in volume. living. Another interesting thing that has yet to be explained is yawning, if a student in the class starts yawning, it will be easy to see other students even teachers will yawn.

The strange thing is that during the long or short yawning process, we begin to feel quieter, the sounds outside are almost small or no longer heard. The reason is interesting activities within the structure of the ear, let's explore the structure of the ear before explaining this problem. Human ear has a structure of 3 parts: outer ear, middle ear and inner ear 

External ear: including the ear and ear canal, which accepts sound 
Inner ear: including cochlea responsible for listening function. The vestibular and semi-plumbing recommend the balance function.
As we know, the sound is a frequency of vibration, which we hear is due to the sound recognition in the outer ear, the ear and the ear canal to the eardrum, the eardrum will vibrate to a similar frequency. As the maximum frequency received, these three small bones act as a conductor that travels to the cochlea and the hair also vibrates with that frequency according to the auditory nerve and to the brain. 

Why didn't I hear anything when yawning?
At the eardrum, there is a part that is the atrium is the part that connects the middle ear to the back of the nasal cavity, some activities such as chewing, swallowing, and yawning make the atrium open for air to enter or exit. from the middle ear (that's why when we tinnitus we often swallow saliva). In other words, the atrium helps balance air pressure in the middle ear.

The pressure balance in the middle ear is the cause, when yawning, the air has not been able to balance the pressure in the middle ear, causing the vibration transmission to work badly so the outside sounds are not transmitted to nerves hearing like normal at yawn. Air pressure before and after the eardrum is unbalanced, causing the eardrum to be immobilized, causing temporary deafness when yawning. In addition, the muscles of the atrial arch and pedal bones are the two main parts for adjusting the volume to the ear. This activity can be described as walking out of a dark room, which tends to close your eyes because at this time the retina is trying to adjust the amount of contact light, the muscles of the atrial arch and the pedal muscles as well. , These two parts tighten to regulate the volume imbalance when yawning, is also an explanation for temporary deafness when yawning.

It is one of the scientific explanations for volume reduction or yawning. You have yawned many times after reading this article. It is a natural mechanism and is also quite important for the body's activities although it is sometimes a little embarrassing. However, what I want to mention here is that we should practice the deep breathing habits to reduce sudden yawning as well as provide enough oxygen for the body's activities that are always fresh or sometimes not wanted. temporary deafness.