Question

explain the ear drum with diagram​

Answer 1

Answer:

The ear has external, middle, and inner portions. The outer ear is called the pinna and is made of ridged cartilage covered by skin. Sound funnels through the pinna into the external auditory canal, a short tube that ends at the eardrum (tympanic membrane).

Answer 2

$\huge\bf{Answer :}$

Construction of Human Ear :

There are three constituents of the human ear - Outer ear, middle ear and inner ear.

The flexible and a circular membrane which is present at the end of the ear canal is referred as Ear-Drum. Ear drum is also considered as Tympanum.

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Functioning of a human ear :

• The sound waves wich are emitted from a body reaches the pinna ( which is a part of inner ear ).
• These collected sound waves then moves through the ear canal and gets accomodated on the ear drum.
• The sound waves contains rarefactions and compressions.
• When the compression of sound waves beats the ear-drum, the pressure increases on the outside lining of ear-drum which pushes the ear-drum in the inward direction.
• When the rarefaction of the sound wave strikes the ear-drum, pressure decreases on the outside part of the ear-drum.
• The ear-drum starts vibrating on regular intervals when the sound waves reaches the ear-drum.
• The vibration in the ear-drum causes the bone hammer to vibrate and the vibrations from the hammer passes on to second bone anvil and then it finally passes through the bone stirrup.
• The vibrations in the stirrup hits the membrane present in the oval window and then, vibrations are passed into the liquid contained in cochlea.
• The vibrations make cochlea to vibrate which sets the nerve cells to produce the electrical impulses.
• Then, auditory nerve carries the electrical impulses to the brain.
• The brain accepts these impulses and we get the sensation of hearing.