The human heart has to pump the average adult’s 6.0 L of

Chapter 10, Problem 74GP

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Problem 74GP

The human heart has to pump the average adult’s 6.0 L of blood through the body every minute. The heart must do work to overcome frictional forces that resist the blood flow. The average blood pressure is .

a. Compute the work done moving the 6.0 L of blood completely through the body, assuming the blood pressure always takes its average value.

b. What power output must the heart have to do this task once a minute?

Hint: When the heart contracts, it applies force to the blood. Pressure is just force/area, so we can write work = pressure × area × distance. But area × distance is just the blood volume passing through the heart.

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