Physics
posted by Constance .
During each heartbeat, approximately 71 cm3 of blood is pushed from the heart at an average pressure of 105 mmHg. Calculate the power output of the heart, in watts, assuming 68 beats per minute.

Physics 
drwls
The work required per beat is
W = V*deltaP, where V is the volume pumped and delta p is the pressure increase provided. To get that in Joules, V must be in m^3 and deltaP must be in Pascals.
W = 71*10^6 m^3*(105/760)*1.01*10^5 Pa
= 0.99 J
divide that by the time between beats, (60 sec/min)/(68 beat/min)= 0.88 s
The result is 0.99/0.88 = 1.13 Watts
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