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time taken by blood to circulate all blood vessels
a. 100 seconds
b. 80 seconds
c. 90 seconds
d. 50 seconds
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Answer:
50 seconds is the answer....
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d) 50 seconds.
On average, it takes about 45 seconds for blood to circulate from the heart, all around the body, and back to the heart again. An average adult's heart beats more than 100,000 times a day.
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