Breathe in.

Oxygen moves into the lungs.

Oxygen is added to the blood by the lungs.

Oxygen-rich blood moves to the heart.

Blood is pumped through the body giving O2 to the cells and taking CO2 from the cells.

Oxygen-poor blood moves back to the heart.

Oxygen-poor blood is pumped to the lungs.

Carbon dioxide is removed from the blood by the lungs.

Breathe out.

Are these steps in order?

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