Hemodynamics — KinFAST

Adaptive test — questions are selected based on your ability estimate. — Tag: ExerciseRedistribution

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During strenuous exercise, cardiac output may rise to three times its resting value, yet mean arterial pressure rises only modestly. At the same time, blood flow to active leg muscles increases substantially while flow to the digestive organs decreases. Which combined change in the systemic vasculature best explains how mean arterial pressure remains relatively well controlled despite the large rise in cardiac output?

Total peripheral resistance rises in proportion to cardiac output, holding mean arterial pressure exactly constant All systemic arterioles dilate equally, so resistance and flow rise in proportion and pressure stays constant Skeletal muscle arterioles constrict while digestive arterioles dilate, redirecting blood through low-resistance pathways Skeletal muscle arterioles dilate markedly while digestive organ arterioles constrict, lowering overall total peripheral resistance enough to accommodate the increased cardiac output

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