Question

. Explain the construction and working of Human Ear.

Answer 1

Working of Human Ear   :-
Sound waves are collected by the pinna and then are directed through ear canal sound waves on striking the eardrum make it vibrate exactly the same way as the given sound emitting object. The bones in thge middle ear start vibrating when eardrum  vibrates. It helps in magnifying the vibrations. When the magnified vibrations reach the cochlea in the inner ear, the fluid in it starts vibrating. These vibrationsare picked up by sensory receptors and are converted into electrical signals. These electrical signals then travel to the brain which interprets sound.

Answer 2

Working of human ear.

The sound waves are collected by the pinna of outer ear. These sound waves pass through the ear canal and falls on the eardrum. Sound waves consists of compressions and rarefactions. When the compression of sound wave strikes the eardrum the pressure on the outside of a drum increases and pushes the eardrum inwards and where the rarefactions of sound wave falls on the eardrum the pressure of the outside of ear drum decreases and it moves outward.

When the sound waves fall on the eardrum the eardrum starts vibrating to and fro rapidly.

Thevibrating ear-drum causes as small bone hummer to vibrate from hummer, vibrations are passed on to the second bone anvil and finally to the third bond stirrup. The vibrating stirrup strikes on the membrane of the oval window and passes its vibrations to the liquid in the cochlea. Due to this the liquid in the cochlea begins to vibrate. The vibrating liquids of cochlea setup electrical impulses in the nerve cells present in it.


These electrical impulses are carried by auditory nerve to the brain. The brain interprets this electrical impulses as sound and we get the sensation of hearing.