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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

a

1.2W

b

1.4W

c

1.6W

d

1.8W

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detailed solution

Correct option is A

p = pressure against which heart is pumping blood = p.g.h = 13.6 x 103 x 10 x 125 x 10-3 N/m2 ⇒17,000 N/m2.
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 103 x 70 x 10-6W = 1.2W

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