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Human Body & Health

If a medication dilates systemic arterioles, which consequence follows regarding homeostatic control of blood pressure?

A)Cardiac output always decreases rapidly
B)Baroreceptor firing always decreases acutely
C)Venous return always increases dramatically
D)Sympathetic activity increases to compensate

💡 Explanation

Vasodilation in systemic arterioles lowers total peripheral resistance, reducing blood pressure. To maintain adequate blood pressure, the baroreceptor reflex increases sympathetic activity, thus increasing heart rate and contractility, rather than a continuous drop in pressure, because the dilation effect needs compensation, therefore, sympathetic activity increases.

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