explain the working of human ear
Answers
Working of human ear.
The sound waves are collected by the pinna of outer ear. These sound waves pass through the ear canal and falls on the eardrum. Sound waves consists of compressions and rarefactions. When the compression of sound wave strikes the eardrum the pressure on the outside of a drum increases and pushes the eardrum inwards and where the rarefactions of sound wave falls on the eardrum the pressure of the outside of ear drum decreases and it moves outward.
When the sound waves fall on the eardrum the eardrum starts vibrating to and fro rapidly.
The vibrating ear-drum causes as small bone hummer to vibrate from hummer, vibrations are passed on to the second bone anvil and finally to the third bond stirrup. The vibrating stirrup strikes on the membrane of the oval window and passes its vibrations to the liquid in the cochlea. Due to this the liquid in the cochlea begins to vibrate. The vibrating liquids of cochlea setup electrical impulses in the nerve cells present in it. this electrical impulses are carried by auditory nerve to the Brain the brain interpret this electrical impulses and sound and we get the sensation of hearing.
Sound waves travel through the external auditory canal. After striking the eardrum it produce vibration. The eardrum is connected to the hammer [three small bones of ear i.e. hammer, incus and stapes]. Then it transmit sound vibrations from hammer to incus and then to stapes....
The stapes pushes vibrations in and out against the structure called oval window... This action is passed on to the cochlea [It is a fluid filled snail like structure].
Cochlea contains Corti. It consists of small hair cells that lies in Corti. These cells transmit vibrations into electrical impulses that carry to the brain by auditory nerves...
The brain interpret these electrical impulses and we get sensation of hearing means we hear sound....
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