Question

explain the working of human ear .

Answer 1

The outer ear is known as 'Pinna'. It collects the sound from the surrounding. The collected sound passes through the auditory canal. At the end of the auditory canal there is a thin membrane known as the ear drum or tympanic membrane. When compression of the medium produce due to vibration of the object reaches the ear drums the pressure on the outside of the membrane increases and forces the ear drum inward.

In the same way, the eardrum moves outward when a rarefaction reaches. By this way the eardrum vibrates. The vibrations are amplified many times by three bones (the hammer, anvil and stirrup) in the middle ear which act as levers. 

The middle ear transmits the amplified, pressure variations received from the sound wave to the inner ear.

The inner ear, the pressure variations are converted into electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.

This is how human ear works.

Answer 2

We Hi friend,

Ear is divided into three parts-:

-Outer ear
-Middle ear
-Inner ear

Outer ear, also known as PINNA. It receives the vibrations and transmits them to the ear canal. The canal convies the vibrations that strikes a stretched membrane called as EAR DRUM also known as TYMPHANIC MEMBRANE. Then from ear drum the vibrations passes to the middle ear.

Middle ear has three delicate bones-:
-Hammer
-Anvil
-Stirrup
These bones pass on the vibrations to the inner ear.
The vibrations will be amplified many times by these bones and then the middle ear will transmit that sound waves to the inner ear.

Inner ear has a coiled tube called COCHLEA. Tiny hairs on this liquid filled tube pick up the vibrations from the middle war and then they send the signals to the brain thorough the auditory nerve and we hear sound. Here the sound turns into electrical signals and sent to brain. And then brain interepts them as sound.

That's all.

Answer is according to 8th class.

Hope it helps................