Posted by **Constance** on Sunday, April 8, 2012 at 11:46pm.

During each heartbeat, approximately 71 cm3 of blood is pushed from the heart at an average pressure of 105 mm-Hg. Calculate the power output of the heart, in watts, assuming 68 beats per minute.

- Physics -
**drwls**, Monday, April 9, 2012 at 10:19am
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

- Physics -
**Anonymous**, Thursday, November 7, 2013 at 1:08am
lol

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