explain the structure and working of human ear
Answers
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.
☆ Structure And Working Of A Human Ear ☆
The ear is the sense organ for hearing. The sound waves reach our ears and we hear the sound. The three parts of the ear are outer ear, middle ear and inner ear.
The outer ear consists of pinna, ear canal and ear drum.
The middle ear consists of a cavity with three interlocked bones namely hammer, anvil and stirrup.
The inner ear consists of a semicircular organ of hearing called cochlea. It is filled with fluid and has many hair cells inside it.
The auditory nerve is also present in the inner ear.
Working Of The Human Ear
1. Pinna collect the vibration from the surrounding and sends them to the ear canal.
2. The vibrations reach the ear drum present at the ends of the ear canal. The ear drum starts vibrating as soon as the vibrations strike it.
3. The three bones of the middle also start vibrating with the ear drum. These three bones amplify the vibrations received from the ear drum and send them to the inner ear.
4. The cochlea receives the amplified vibrations and converts them into nerve impulses. The tiny hair and semicircular canal get stimulated due to this vibrations. As a result, the nerve impulses are sent to the brain via the auditory nerve present in the inner ear.
5. The brain records the nerve impulses and we are able to hear the sound.
