katyzzzWorking of Human Hear
July 13th 2006 23:07
Working of Human Hear :
Ears are extraordinary organs. They pick up all the sounds around us and then translate this information into a form our brain can understand. One of the most remarkable things about this process is that it is completely mechanical. Our sense of smell, taste and vision all involve chemical reactions, but our hearing system is based solely on physical movement.
There are mechanical systems that make hearing possible. the path of a sound can be traced from its original source all the way to our brain, to see how all the parts of the ear work together. When you understand everything they do, it's clear that your ears are one of the most incredible parts of your body!
Sound Basics :
To understand how our ears hear sound, first need to understand just what sound is.
An object produces sound when it vibrates in matter. This could be a solid, such as earth; a liquid, such as water; or a gas, such as air. Most of the time, we hear sounds traveling through the air in our atmosphere.
When something vibrates in the atmosphere, it moves the air particles around it. Those air particles in turn move the air particles around them, carrying the pulse of the vibration through the air.
To see how this works, let's look at a simple vibrating object: a bell. When you hit a bell, the metal vibrates -- flexes in and out. When it flexes out on one side, it pushes on the surrounding air particles on that side. These air particles then collide with the particles in front of them, which collide with the particles in front of them, and so on. This is called compression.
To hear sound, your ear has to do three basic things:
Direct the sound waves into the hearing part of the ear
Sense the fluctuations in air pressure Translate these fluctuations into an electrical signal that your brain can understand The pinna, the outer part of the ear, serves to "catch" the sound waves. Your outer ear is pointed forward and it has a number of curves. This structure helps you determine the direction of a sound. If a sound is coming from behind you or above you, it will bounce off the pinna in a different way than if it is coming from in front of you or below you. This sound reflection alters the pattern of the sound wave. Our brain recognizes distinctive patterns and determines whether the sound is in front of you, behind you, above you or below you.
Bone Amplifier :
The compressions and rarefactions in sound waves move our eardrum back and forth.
the cochlea in the inner ear conducts sound through a fluid, instead of through air. This fluid has a much higher inertia than air -- that is, it is harder to move (think of pushing air versus pushing water). The small force felt at the eardrum is not strong enough to move this fluid. Before the sound passes on to the inner ear, the total pressure (force per unit of area) must be amplified.
This is the job of the ossicles, a group of tiny bones in the middle ear. The ossicles are actually the smallest bones in our body. They include:
The malleus, commonly called the hammer.
The incus, commonly called the anvil.
The stapes, commonly called the stirrup.
Conclusion :
Hence one has to look into the depth and importance of one's hear to catch up with remarkable waves of sound which is a very essential tool of survival.
Ears are extraordinary organs. They pick up all the sounds around us and then translate this information into a form our brain can understand. One of the most remarkable things about this process is that it is completely mechanical. Our sense of smell, taste and vision all involve chemical reactions, but our hearing system is based solely on physical movement.
There are mechanical systems that make hearing possible. the path of a sound can be traced from its original source all the way to our brain, to see how all the parts of the ear work together. When you understand everything they do, it's clear that your ears are one of the most incredible parts of your body!
Sound Basics :
To understand how our ears hear sound, first need to understand just what sound is.
An object produces sound when it vibrates in matter. This could be a solid, such as earth; a liquid, such as water; or a gas, such as air. Most of the time, we hear sounds traveling through the air in our atmosphere.
When something vibrates in the atmosphere, it moves the air particles around it. Those air particles in turn move the air particles around them, carrying the pulse of the vibration through the air.
To see how this works, let's look at a simple vibrating object: a bell. When you hit a bell, the metal vibrates -- flexes in and out. When it flexes out on one side, it pushes on the surrounding air particles on that side. These air particles then collide with the particles in front of them, which collide with the particles in front of them, and so on. This is called compression.
To hear sound, your ear has to do three basic things:
Direct the sound waves into the hearing part of the ear
Bone Amplifier :
The compressions and rarefactions in sound waves move our eardrum back and forth.
the cochlea in the inner ear conducts sound through a fluid, instead of through air. This fluid has a much higher inertia than air -- that is, it is harder to move (think of pushing air versus pushing water). The small force felt at the eardrum is not strong enough to move this fluid. Before the sound passes on to the inner ear, the total pressure (force per unit of area) must be amplified.
This is the job of the ossicles, a group of tiny bones in the middle ear. The ossicles are actually the smallest bones in our body. They include:
The malleus, commonly called the hammer.
The incus, commonly called the anvil.
The stapes, commonly called the stirrup.
Conclusion :
Hence one has to look into the depth and importance of one's hear to catch up with remarkable waves of sound which is a very essential tool of survival.
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