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Hearing


Our ears also help us realize what is happening around us. In addition to perceiving sounds, they also give us information about the position of our bodies and are partly responsible for our balance.

O auditory hall (outer ear) concentrates and picks up the sound so we can hear the sounds of nature, differentiate the sounds coming from the sea from the sound coming from a car, the loud and faint sounds, bass and treble.
Because we have two ears, one on each side of the head, we can locate how far the sound emitter is. We noticed the difference of sound arrival in the two different ears. In this way we can calculate how far the sender is. Our ears capture and concentrate air vibrationsor rather the sound waves that pass into the inner part of our hearing medium earswhere the vibration of the air makes our eardrums flutter - the membranes that separate the outer ears from the medium ones.


This vibration, in turn, will be transmitted to three ossicles, the hammer, a anvil it's the stirrup. Through these bones, sound travels in a solid medium and is transmitted faster. Thus, the vibration reaches the oval window - about twenty times smaller than the eardrum - concentrating in this region and amplifying the sound.
From the inner ear, nerve impulses depart. Our hearing aid can amplify the sound about one hundred and eighty times until the stimulus reaches the acoustic nerve, which will carry the information to the brain. When we move the head, we also move the liquids in the semicircular canals and the inner ear vestibule. It is this movement that generates the stimuli that give information about the movements that our body is making in space and about the position of the head, thus transmitting to us the notion of balance.

The ear is best known as the sense organ of hearing, but it also helps maintain balance - postural orientation - and a sense of direction. Within the inner ear, there is a balance perception “equipment”: semicircular canals, also called mazes that are filled with liquid. These structures do not participate in the listening process. When we move our head, the liquid moves inside the channels. The displacement of this fluid stimulates specific nerves, which send the brain information about our body's position in relation to the environment. Our brain interprets the message and commands the muscles that act to maintain body balance.

For this equipment to work properly, take good care of it!

  • Is the ear dirty? Cleaning in it! But WARNING: no swab! Otherwise you can do the most damage to your ear! Ask an adult for a little help to show you how to do it: just use your own towel and clean only the outside, front and back. You can let the doctor take care of the inside!
  • Beach and pool They are delicious, and diving is even better. But be careful: try not to let water get in your ear and dry it after you leave it by turning your head sideways and applying light pressure. But if you are a great diver and can't stand still, ask an adult to take you to the doctor; He may prescribe a tailor made cap for you.
  • Also heard "spent", you know? If you don't take good care of yours, you may not be listening properly… so be careful listening to music on the walkman: Very loud sound harms delicate hearing organs, and may even cause a headache and ringing in the ear. The best thing is to avoid the headphones, or listen quietly.
  • If you have ever traveled to mountain regions or traveled by plane, you may have had the feeling of being "deaf", right? This is because of the change in air pressure: Not to bother too much, when this happens, you can swallow saliva several times, or open your mouth wide. On a long trip, it's nice to suck on a bullet or chew gum. Don't be surprised if your ear is popping!

Noise pollution

We say there is noise pollution when the noise bothers us because it is too loud for our hearing system. Human hearing at normal levels picks up sounds from 10 or 15 decibels. Up to about 80 to 90 decibels, sounds are harmless to human hearing. Above this, they can cause headaches, irritability and insomnia and, especially, decreased hearing ability.

According to WHO, the “noise volume” in cities should not exceed 70 decibels to avoid noise pollution.