Question

draw a structure of human ear and explain how the ear receives sound

Answer 1

The shape of the outer part of the ear is like a funnel. when sound enters it, it travels down a canal at the end of which a thin membrane is stretched tightly. it is called the eardrum. sound vibration make the eardrum vibrate the eardrum sends vibration to the inner ear from there the signal goes to the brain and that is how we hear.

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Answer 2

sound waves from outside are collected by the outer ear and reach the eardrum.when the sound waves strike the eardrum,it starts vibrating.these vibrations are passed onto the oval window made by three bones called the hammer ,Anvil and stirrup which act as a Lever with the pivot.the magnified the force of the vibrations.
The oval window has a smaller area than the eardrum.so this increases pressure on the oval window and on the liquid in the cochlea.
The vibrations of the liquid in the cochlea effect thousands of auditory nerves which send messages to the brain.

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