1
00:00:00,620 --> 00:00:06,620
The ability to accurately identify sound is possible due to the auditory system..

2
00:00:07,120 --> 00:00:10,119
..that is comprised of your ears and the brain.

3
00:00:10,619 --> 00:00:15,619
The ear's job is to convert the sound energy into a neutral signal..

4
00:00:16,120 --> 00:00:20,620
..which later is received by your brain through three parts of the ear.

5
00:00:21,120 --> 00:00:25,620
The outer ear, the middle ear and the inner ear.

6
00:00:26,120 --> 00:00:30,120
But the big question is, how does it work?

7
00:00:30,620 --> 00:00:38,939
Well, it all starts with the sound waves falling on the outer part of your ear known as the pinna

8
00:00:38,939 --> 00:00:46,479
that acts as a funnel and sends the sound into the ear canal, another part of your outer ear

9
00:00:46,479 --> 00:00:56,200
and heads towards the middle part of your ear hitting the eardrum, a very delicate piece of tightly stretched skin

10
00:00:56,200 --> 00:01:00,140
making it vibrate like the head of an actual drum.

11
00:01:00,619 --> 00:01:06,859
This vibrating eardrum shakes a tiny chain of three bones called the ossicle..

12
00:01:07,060 --> 00:01:11,060
..that starts with a hammer and passes through the angle..

13
00:01:11,260 --> 00:01:15,859
..and moves the third bone known as tapes or stirrup.

14
00:01:17,659 --> 00:01:19,659
But it's not over yet.

15
00:01:19,859 --> 00:01:23,859
Once the sound passes the middle ear through the ossicle..

16
00:01:24,060 --> 00:01:28,060
..it travels into the cochlea, a small circular tube..

17
00:01:28,060 --> 00:01:32,060
Filled with liquid situated in the inner ear.

18
00:01:33,060 --> 00:01:36,060
The cochlea consists of many hair.

19
00:01:36,060 --> 00:01:41,060
And when the fluid in the cochlea moves, it moves these tiny hair.

20
00:01:41,060 --> 00:01:47,060
Creating nerve signals that get sent through the auditory nerve into the brain.

21
00:01:47,060 --> 00:01:52,060
The brain processes these signals as sound and so you hear.

22
00:01:54,060 --> 00:01:57,060
Also, not all living creatures hear with ears.

23
00:01:57,060 --> 00:02:05,659
ears, snakes use jaw bones, fish respond to pressure changes and male mosquitoes use antenna.