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The heart is the pump that circulates blood throughout the body. The body itself does not actively push the blood along by any means, though there are one-way valves in the veins where the pressure is lower. Ultimately the deoxygenated blood reaches the heart due to the pressure of the blood behind it, constantly being pumped forward by the heart.

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12y ago
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15y ago

Veins... ateries move oxygenated blood.

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Q: What transports blood back to the heart and lungs when the blood no longer contains sufficient oxygen to fuel the body?
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A disc shaped cell that has no nucleus that contains hemoglobin and that transports oxygen in the circulatory system?

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