1
00:00:01,899 --> 00:00:07,900
The blood goes back to the heart to the lungs.

2
00:00:07,900 --> 00:00:13,900
In the lungs the blood exchange happens and the blood takes the oxygen and expels the CO2.

3
00:00:13,900 --> 00:00:18,899
Then the blood goes back to the heart and is pumped again to the body cells.

4
00:00:18,899 --> 00:00:23,899
And the blood delivers the oxygen and takes the CO2.

5
00:00:23,899 --> 00:00:29,899
And the blood with CO2 goes again to the heart.

6
00:00:29,899 --> 00:00:33,899
And so it starts again and again and again.