Physicshard · Past Paper
A human heart discharges 75 cc of blood at each beat against a pressure of 0.1 m of Hg. If the pulse rate is 80 per minute, the power of the heart is (density of Hg=13.6g/cc):
A1.33 W
B1.76 W
C2.0 W
D1.0 W
✓ Correct Answer: A — 1.33 W
Work per beat = Pressure * Volume. Power = (W/beat * beats/min) / 60. Converts to approx 1.33 Watts.
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