Kaplan FL 7 C/P - Question 44

[jwarren10101]

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Could someone explain the answer to this question? Thanks in advance!

Pulmonary hypertension increases the amount of pressure required to deliver the same amount of blood. What effect would this have on the heart?

A: It increases the average amount of work done by the heart.

 

[lumya]

Pressure = force/area. Since area of the arteries is constant, if pressure goes up, so does force.
Work = force x distance. Since force has increased and distance is the same, work has increased to pump blood the same distance.