Which of the following substances would be expected to cause an increase in arterial blood pressure?

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[Chapter 3, III E; VI B]. $V_{1}$ agonists simulate the vasoconstrictor effects of antidiuretic hormone (ADH). Because saralasin is an angiotensin-converting enzyme
(ACE) inhibitor, it blocks the production of the vasoconstrictor substance angiotensin II. Spironolactone, an aldosterone antagonist, blocks the effects of aldosterone to increase distal tubule $\mathrm{Na}^{+}$reabsorption and consequently reduces extracellular fluid (ECF) volume and blood pressure. Phenoxybenzamine, an $\alpha$-blocking agent, inhibits the vasoconstrictor effect of $\alpha$-adrenergic stimulation. Acetylcholine (ACh), via production of endotheliumderived relaxing factor (EDRF), causes vasodilation of vascular smooth muscle and reduces blood pressure.

Which of the Following Substances Would Be Expected to Cause V1\mathrm{V}_{1}V1​

Which of the Following Substances Would Be Expected to Cause $\mathrm{V}_{1}$