The human heart has to pump the average adult’s 6.0 L of
Chapter 10, Problem 74GP(choose chapter or problem)
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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