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Question

The three parts of human ear contributing in hearing are -

A
cochlea, ear ossicles and tympanum
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B
semicircular canals, utriculus and sacculus
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C
eustachian tube, tympanum and utriculus
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D
perilymph, ear ossicles and semicircular canals.
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Solution

The correct option is A cochlea, ear ossicles and tympanum
The process of hearing starts at tympanic membrane where the sound waves are converted into mechanical stimulus. This mechanical stimulus is transmitted to stapes footplate through the ossicular chain, here it is transformed into hydraulic energy for transmission through the cochlea, from here the nerves of hearing are excited.
Hence the correct option is 'Cochlea, ear ossicles, and tympanum'.

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