Question

how do we hear a sound

Answer 1

1. sound waves enter the outer ear and travel through a narrow passengeway called the ear Canal ,which leads to the eardrum.
2. the ear drum vibrates from the incoming sound waves and sends these vibrations to 3 tiny bones in the Middle ear. these bones are called malleus,incus and stapes.
3. the bones in the Middle ear amplify, or increase the sound vibrations and send them to the cochlea,a snail shaped structure filled with fluid in the inner ear. an elastic partition friends from the beginning to the end of the cochlea splitting it into an upper and lower part. this partition is called the basilar membrane because it serves as the base or ground floor on which key hearing structures sit.
4. once the vibrations cause the fluid inside the cochlea to ripple, a travelling waves form along the basilar membrane.
hair cells- sensory cells sitting on top On the basilar membrane-ride the wave. hair cells near the wide end of the snail shaped cochlea detect higher pitched sounds, such as an infant crying. those closer to the Central detect lower pitched sounds, such as a large dog barking.
5. as the hair cells move up and down, microscopic hair like projections(known as stereocilia) that Perch on top of the hair cells bump against an overlying structure and bend. bending causes pore like channels which are at the tips of the stereocilia, to open up. when that happens, Chemicals rush into the cells, creating an electrical signal.
6. the auditory nerve carries this electrical signal to the brain which turns it into a sound that we recognise and understand.
Please mark it as brainliest answer.

Answer 2

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External ear collects the sound waves. The sound waves travel through the ear canal. At the end of the ear canal there is a thin stretched membrane called the ear drum. Sound waves make the ear drum vibrate. The eardrum sends vibrations to the inner ear. From the inner ear, the signal goes to the brain through the auditory nerve.