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2014-11-09T22:47:07+05:30

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Power = force×velocity
          =(pressure×area)×(distance travelled per unit time)
          = pressure × (area×distance travelled) per unit time
          = pressure × volume per unit time

No. of beats per minute = 72
beats per second = 72/60= 6/5 = 1.2
volume pumped per second = 70×1.2 = 84 ml = 8.4×10^(-5)m³
pressure = 12 mm Hg = 1600 Pa

Power = 1600×8.4×10^(-5) = 0.1344 J/s
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2014-11-10T11:57:10+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
I take pressure given as pressure in terms of mm of mercury column.

Power = energy / time 
           = Force * distance / time = Pressure * area * distance / time
          = Pressure * volume / time 
          = 12 /1000 m * 13,600 kg/m² * 10 m/sec² * 70 /(1000 *1000) m³ * (72 / 60 sec)
          = 12 * 13600 *10 *70 * 72 / (1000*1000*1000*60)  watts
          =  137.088 milli watts
          = 0.137 Watts
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Volume of blood pumped from heart = blood flow rate 
            =  70 ml * 72 / 60 sec = 84 ml / sec

Pressure = 12 /1000 m * 13,600 kg/m² * 10 m/sec² = 1632 N/m² or Pa

Power = pressure * flow rate = 1632 * 84 = 137.088 milli Watts

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