What contracts to pump blood out of the heart?
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The atria and ventricles work together, contracting and relaxing to pump blood out of the heart. As blood leaves each chamber of the heart, it passes through a valve. There are four heart valves within the heart: Mitral valve.
yeh but what contracts?
aorta....
ohhhhh never mind thanks mate
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aorta pump the oxygenated blood to the whole body
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the arteries
the ventricles
the atria