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← Human Body & HealthWhat causes decreased blood pressure when peripheral blood vessels dilate during exercise?
A)Increased blood return to heart
B)Decreased total peripheral resistance✓
C)Elevated plasma protein concentration
D)Heightened sympathetic nervous activity
💡 Explanation
Vasodilation reduces resistance to blood flow because the total peripheral resistance decreases as blood vessels widen; therefore, blood pressure drops rather than increasing due to increased cardiac output, allowing more blood to flow with less force.
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