where does the blood go when the heart relaxes ??
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At the same time, carbon dioxide is released from the blood. Blood circulation starts when the heart relaxes between two heartbeats: The blood flows from both atria (the upper two chambers of the heart) into the ventricles (the lower two chambers), which then expand.
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Answer:
At the same time, carbon dioxide is released from the blood. Blood circulation starts when the heart relaxes between two heartbeats: The blood flows from both atria (the upper two chambers of the heart) into the ventricles (the lower two chambers), which then expand
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