How Do We Hear Sound through Ear, Structure of Ear, Perception of Hearing (For CBSE, ICSE, IAS, NET, NRA 2022)

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How Do We Hear Sound through Ear

  • The human ear is an intricate and delicately balanced structure of the body with which we are able to detect, differentiate, filter, and identify sounds.
  • When something makes a noise, it sends sound waves through the air.
  • The hearing starts when your outer ear channels these sound waves down its auditory canal into your middle ear where sound is amplified.
  • So, the sound waves hit your eardrum making it vibrate and the vibrations are then transmitted into the inner ear.
  • This is where the sound waves are converted into nerve impulses which travel to the hearing center in your brain due to the stimulation and movement of tiny hair-like nerve endings.
  • Your brain recognizes and processes the nerve impulses and tells you what you are hearing.

How Do We Hear

How Do We Hear
  • The sound is one of the most beautiful forms of energy.
  • It is probably the first thing we experience in the morning when we wake up – we hear the sound of birds chirping or the alarm clock ringing.
  • Sound fills our usual life with excitement.
  • We can hear these sounds through our ears.

Structure of Ear

Structure of Ear
  • A sound produced by objects like drum or alarm clock is carried away from the object to the ears through the air which acts as the medium. The sound produced is in the form of vibration.
  • It firstly enters in the ears through the funnel-shaped outer part of the ear. It moves down through a canal till the eardrum.
  • Eardrum plays an important role in the functioning of the ears.
  • Vibrations produced by the objects reaches till the eardrum through the air. These vibrations produced to make the eardrum vibrate.
  • After that the vibrations are passed to the inner ear through middle ear bones or ossicles.
  • The shape of the inner ear is like a snail. The inner ear is also termed as the cochlea.
  • There are a numerous number of tiny hair cells present inside the cochlea. These hair cells convert the vibrations into electrical signals which are then transferred to the brain through the auditory nerve.
  • This is how we detect sound or noise.

Perception of Hearing

  • Sound creates vibrations in the air similar to the rippling waves created when a stone is thrown into a pond.
  • The outer-ear “trumpet” collects these sound waves, and they are funneled down the external ear canal to the eardrum.
  • As the sound waves strike the eardrum, they cause it to vibrate.
  • The vibrations are transmitted through the middle ear over the bony bridge formed by the hammer, anvil, and stirrup.
  • In turn, cause the membranes over the openings to the inner ear to vibrate, causing the fluid in the inner ear to be set in motion.
  • Motion of the fluid in the inner ear excites the nerve cells in the organ of Corti, producing electrochemical impulses that are gathered and transmitted to the brain along the acoustic nerve.

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