試題詳解

15. 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) If the arterial blood pressure to an organ suddenly decreases, arterioles in the organ will dilate in response.
(C) Binding of epinephrine to alpha-adrenergic receptors causes vasodilation.
(D) Increased stimulation of vascular smooth muscle by the parasympathetic nervous system causes increased vasoconstriction.