What is the mechanism of hearing - Class 11 - (Plz answer step by step as points. In an easy way also)
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Mechanism of Hearing-
Sound funnels into the ear canal and causes the eardrum to move.
The eardrum vibrates with sound.
Sound vibrations move through the ossicles to the cochlea.
Sound vibrations cause the fluid in the cochlea to move.
Fluid movement causes the hair cells to bend. Hair cells create neural signals which are picked up by the auditory nerve. Hair cells at one end of the cochlea send low pitch sound information and hair cells at the other end send high pitch sound information.
The auditory nerve sends signals to the brain where they are interpreted as sounds.
Sound funnels into the ear canal and causes the eardrum to move.
The eardrum vibrates with sound.
Sound vibrations move through the ossicles to the cochlea.
Sound vibrations cause the fluid in the cochlea to move.
Fluid movement causes the hair cells to bend. Hair cells create neural signals which are picked up by the auditory nerve. Hair cells at one end of the cochlea send low pitch sound information and hair cells at the other end send high pitch sound information.
The auditory nerve sends signals to the brain where they are interpreted as sounds.
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Answer: ★Mechanism of hearing:
★The external ear receives sound waves and directs them to the ear drum.
★Sound waves are amplified by the ear ossicles and send it to the oval window in the middle ear.
★The vibration of the oval window creates waves in the perilymph of scala vestibuli.
★The waves in perilymph induce a ripple in the basilar membrane.
★Movements of the basilar membrane bend the hair cells, pressing them against the tectorial membrane.
★As a result nerve impulses are generated in the associated afferent neuron.
★These impulses are transported to the auditory cortex of the brain where the impulses are analysed and the sound is recognized.
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