circulatory .
Oxygen to remove carbon dioxide..
The respiratory system removes carbon dioxide from the blood and brings oxygen into the blood. This process occurs through the lungs, where oxygen from the air is exchanged for carbon dioxide in the blood.
You need a respiratory system to bring oxygen into your body and to remove carbon dioxide from your body..
The respiratory system
circulatory .
circulatory .
circulatory .
carbon dioxide
circulatory .
circulatory .
circulatory .
respiratory :)