The human ear is divided into three parts: outer ear, middle ear and inner ear.
- There are two ways for human ears to hear sound:
Air conduction:
Sound waves are transmitted to the auricle through the air and through the external auditory canal, causing tympanic membrane vibration. The tympanic membrane drives the three auditory ossicles in the middle ear chamber to move mechanically with each other. The movement of the last auditory ossicle drives the fluid flow in the inner ear and cochlea to generate electrical signals and stimulate the auditory nerve to obtain hearing.
This process: the process of sound “sound wave mechanical motion electrical signal”.
- Bone conduction: in addition to air conduction, bones can also transmit sound. The skull vibrates and transmits the sound to the inner ear. The sound can also be heard.
- General hearing loss is divided into conductive deafness, neurological deafness and mixed deafness.
Conductive deafness: the physical vibration of sound waves cannot be transmitted or transmitted through air, bone or other tissues due to some lesions of the outer and middle ears. Most are treatable.
Sensorineural deafness: caused by the destruction of the inner ear.
Mixed deafness: both conductive deafness and sensorineural deafness.
Central deafness: the brain cannot correctly process, recognize or understand sound or speech.
Non organic deafness: it is often called “functional deafness”. In fact, there is no damage to the hearing mechanism, but due to some psychological factors.
Scientists have found that noise induced hearing loss can destroy the hair cells of the inner ear due to the loud vibration force. In this case, the only prevention is to reduce sound exposure and use ear protection. Noise exposure can lead to the formation of some molecular free radicals, and this molecule can cause hair cell death.
The effect of noise exposure is cumulative. You heard a particularly harsh sound today, and the effect on hearing accumulation may not appear until many years later.
Some people like to turn on the speaker to the maximum and open the window to let everyone have fun, but scientists have found that, The organ “balloon” near the ear, which is responsible for detecting the location of the human body, will be stimulated by loud music. It will also activate the pleasure center in the brain. For some people, its influence is obviously great. People who are used to listening to music loudly will have withdrawal symptoms similar to those of hermits after suddenly losing these decibels of drugs. A person’s “pleasure” “And another person’s pain, but in fact, whether it is” pleasure “or pain, high volume can cause hearing loss and nerve hair loss.
It has long been a foregone conclusion that the noise of aircraft makes the heartbeat of Antarctic penguins and other seabirds faster. The U.S. Navy and the National Marine Fisheries Administration recognized for the first time that the strong sonar interference generated by naval sonar research led to the reef striking and death of marine mammals. Similarly, the harm of noise to human beings should not be underestimated. Noise pollution can not only affect people’s hearing, but also lead to high blood pressure, heart disease, memory decline, inattention and other mental syndromes. The latest scientific research has confirmed that noise can also hurt people’s eyes, causing eyesight fatigue and weakening. When the noise intensity is 90 dB, about half of people will have dilated pupils and blurred vision; When the noise reaches or exceeds 110 dB, almost everyone’s eyeball’s adaptation to light brightness is weakened to varying degrees. This is why people who live in a noisy environment for a long time are particularly prone to eye fatigue, eye pain, eye dizziness, tears and other eye injuries.
Tranquility is the environment we most want to live in. Let’s join hands to improve our self-cultivation, starting from bit by bit. Not only do it well, but also affect the people around you. Everyone is an executor. I think as long as we work together, our living environment will be better and better!