Questions
Human heart pumps 70 cc of blood at each beat against a pressure of 125 mm of Hg. If the pulse frequency is 72 per minute, the power of the heart is nearly
1.2W
1.4W
1.6W
1.8W
detailed solution
Correct option is A
p = pressure against which heart is pumping blood = p.g.h = 13.6 x x 10 x 125 x N/ ⇒17,000 N/.
If A be the effective area of flow of blood, then resistive force F = p.A. If v be the average velocity of flow of blood, then power = Fv = pAv = p x (Av) = p x Q
= 17 x x 70 x W = 1.2W
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