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I wouldn't exactly characterize it as separating carbon dioxide and oxygen, however, I think the answer you are looking for is the lungs which takes up oxygen into the bloodstream and expels carbon dioxide out of the bloodstream into the lungs so we can breathe it out again.
The Lungs
The lungs
Brain :)
In the lungs. This process is called the Gas Exchange.Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
the lungs!!
The lungs supplies the bloodstream with oxygen. When we breathe in, out lungs fill with oxygen and that oxygen is taken to the heart to keep our body going.
The Heart
I wouldn't exactly characterize it as separating carbon dioxide and oxygen, however, I think the answer you are looking for is the lungs which takes up oxygen into the bloodstream and expels carbon dioxide out of the bloodstream into the lungs so we can breathe it out again.
The Lungs
The lungs
The same as ours... They inhale air into their lungs - where oxygen is absorbed into the bloodstream, while carbon dioxide is expelled.
Carbon monoxide
the liver
the organ
Your bloodstream can't store oxygen for an extended period; it just transports it from the lungs to where it is needed.
The LUNGS