After that, sound
waves travel through the ear canal.
After that, sound
waves go to ear drum and vibrate it.
The three
bones in the middle ear transmit the
sound vibrations to the inner ear. Around the three bones is a cavity.
In the
inner ear, there is a cochlea. It is like a snail. It is full of fluid. In the cochlea, there
are hair cells above the gel.
In the
cochlea, the sound vibrations make
the gel and hair cells sway. Its movements send messages to the
brain so that we can hear.
DO YOU KNOW?
The shape of the outer
ear increase volume and determine where it comes from.
The shape of ear
canal is a tube.
The length of the
ear canal of human is about 2.5 cm.
The length of the
three bones is only 3 mm. It is the smallest bones in the body.
