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← Human Body & HealthDuring vigorous exercise, which mechanism ensures sufficient muscle oxygenation, overriding local blood pressure?
A)Metabolic vasodilation overcoming vascular resistance✓
B)Increased aldosterone causing sodium retention
C)Baroreceptor activation increasing heart rate
D)Erythropoietin stimulating red blood cell production
💡 Explanation
Local metabolic demand increases adenosine, triggering metabolic vasodilation; this reduces vascular resistance and floods muscles with oxygen because this overrides typical pressure gradients, rather than baroreceptor reflexes adapting systemically.
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