Sympatholytic drugs such prazosin (Minipress) and doxazosin (Cardura)

Sympatholytic drugs such prazosin (Minipress) and doxazosin (Cardura) can directly decrease vascular resistance by:
A)   stimulating alpha-1 receptors on the arteriole.
B)   blocking alpha-1 receptors on the arteriole.
C)   stimulating alpha-2 receptors on the arteriole.
D)   blocking alpha-2 receptors on the arteriole.
E)   stimulating beta-1 receptors on the arteriole.

Presynaptic adrenergic inhibitors such as reserpine (Serpalan, others) and guanethidine (Ismelin) decrease activity at peripheral arterioles by impairing the release of:
A)   epinephrine.
B)   norepinephrine.
C)   acetylcholine.
D)   dopamine.
E)   5-hydroxytryptamine (serotonin).

A sudden severe, life-threatening increase in blood pressure (autonomic crisis) should be treated with:
A)   diuretics.
B)   alpha-1 agonists.
C)   alpha-2 antagonists.
D)   beta-agonists.
E)   ganglionic blockers.