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How do the lungs and heart transport oxygen in the cardiorespiratory system?

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The lungs hold air that is breathed in. Oxygen gas in the air moves into the blood. The heart pumps to transports this oxygenated blood to cells in the body that need it to produce energy.
User Talib
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The lungs hold air that is breathed in. Oxygen gas in the air moves into the blood.
User Simon Chiu
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