1
00:00:02,799 --> 00:00:04,799
The respiratory system.

2
00:00:04,799 --> 00:00:07,799
Parts of the respiratory system.

3
00:00:07,799 --> 00:00:10,800
The air enters through the nose.

4
00:00:10,800 --> 00:00:19,239
The air goes to the trachea.

5
00:00:19,239 --> 00:00:22,239
Once it goes through the trachea,

6
00:00:22,239 --> 00:00:24,239
it goes through each branch.

7
00:00:24,239 --> 00:00:26,239
And when it goes through each branch,

8
00:00:26,239 --> 00:00:29,940
it passes to the brain.

9
00:00:29,940 --> 00:00:34,380
It reaches to the air sac.

10
00:00:34,380 --> 00:00:37,380
And in the air sac, the air sac gases change.

11
00:00:37,380 --> 00:00:39,380
They dispel the CO2

12
00:00:39,380 --> 00:00:41,020
Thanks again. Go to the door.