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Human Body: Heart and Lungs
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| Team Work |
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| | Your heart is two pumps. One pump sends blood to pick up oxygen from the lungs. The other pump takes in blood full of oxygen from the lungs. |
| | Your muscles need more oxygen when you run. They need to get rid of more carbon dioxide. |
| | Your heart and lungs work harder when you run. |
| | Being active, getting rest, and eating fruits and vegetables help your heart and lungs stay fit. |
