How long does it take for the blood to make its round-trip journey to and from the heart?

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This mind bloggling trip takes less than a minute! The pumping heart muscle loses no time - it never stops. In a healthy body there are no traffic jams, since arteries and veins are one-way streets. Thanks to very efficient valves the blood can flow only one way, make a quick side trip to the lungs for an exchange of air and then start on its way again.

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