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Veins have to ensure that blood under low pressure can return to the heart.
The...
Biology, 20.03.2021 23:20 kristofwr3444
Help please
Veins have to ensure that blood under low pressure can return to the heart.
The circuit of circulation that goes from the heart to the body cells and back to the heart is called circulation.
he oxygenated and deoxygenated blood are kept separate in the mammalian heart by the .
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