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Get Answers to all your Questions
Q6. Give a brief account of:
(c) Mechanism of hearing
Answers (1)
Mechanism of hearing is given below:
- Sound waves are collected by the pinna of the external ear.
- The waves pass through the external auditory meatus to the ear drum.
- The ear drum begins to vibrate.
- The vibrations through the air drum are passed on to the malleus, incus and stapes of the middle ear. Here, the frequency of vibrations increases.
- Through the oval window, vibrations are further passed to the cochlea of the inner ear.
- The vibrations set in the endolymph of the cochlea induce vibrations in the basilar membrane.
- Vibrations of the basilar membrane cause sensory hair of the organ of Corti to vibrate.
- The receptor hair cells press themselves against the tectorial membrane which convert the sound energy into the action potential or nerve impulse.
- The nerve impulse is transmitted to the auditory cortex of the brain.
- The impulses are analysed at the auditory cortex and the sound is recognised.
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