How does circulation begins?
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Answer: 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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Air is taken by the lungs
Passed to the heart to pump blood
By the artery
The dioxygenated blood is brought by the vein for purification
And this air we breathe out .
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