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This is how the two systems work together. Once you breathe in, your lungs, part of the respiratory system, recieve fresh air. The oxygen, found in the air, goes through your lungs, and into the left side of your heart. Then, it is pumped by your heart into your blood stream. This provides blood for your body.

The circulatory system helps to pump blood throughout the body. This is important because red blood cells work to carry oxygen throughout the body. The respiratory system is what allows us to breathe in this oxygen that is later absorbed by red blood cells. The respiratory system also extracts carbon dioxide from the blood which we later breathe out.

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