Which of the following statements concerning control of blood flow through arterioles is TRUE?
A. Beta-adrenergic receptors are more abundant on most arteriolar smooth muscle than are alpha-adrenergic receptors.
B. Body-wide constriction of arterioles results in a decrease in the total peripheral resistance (TPR).
C. Binding of epinephrine to alpha-adrenergic receptors causes vasodilation.
D. If the arterial blood pressure to an organ suddenly decreases, arterioles in the organ will dilate in response.
E. Increased stimulation of vascular smooth muscle by the parasympathetic nervous system causes increased vasoconstriction.
Answer: D
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