The normal heart pumps about 80ml of blood in one beat, and the average pressure of blood flow in one beat is 1.6 * 10 ^ 4pa Suppose that the heart beats 70 times per minute, how many watts can the average power of the normal heart to promote blood flow be calculated?

F = P * s section
V = s section * l
W = f * l = P * s section * l = P * V = 1.6 * 10 ^ 4 * 80 * 10 ^ - 6 = 1.28j
P=W/t=1.28/(60/70)=1.49w

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