CBSE Class 11-science Answered
Explain the mechanism of hearing.
Asked by subhajit.690 | 02 Dec, 2016, 11:01: PM
Expert Answer
1.The pinna collects sound waves and conducts them through the external auditory canal. They finally strike on the ear drum and the vibration is set.
2.The Eustachian tube equalises the air pressure on either side of the ear drum allowing it to vibrate freely.
3.The vibrating ear drum sets the three ear ossicles into vibration. The vibration of the first two ossicles, i.e. malleus and incus, magnifies the vibration in stapes.
4.The stapes transmits vibration to the membrane of the oval window which sets the fluid in the cochlea into vibration.
5.The vibrating movement in the fluid stimulates hair-like processes of sense cells of the cochlea and the impulses are transmitted to the brain via the auditory nerve.
Answered by Sivanand Patnaik | 04 Dec, 2016, 05:06: PM
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