Final answer:
Metaraminol is an alpha-1 receptor agonist which causes the constriction of blood vessels, thus increasing blood pressure. It is therefore, option D) Vasoconstriction, that correctly describes its pharmacologic effect.
Step-by-step explanation:
The pharmacologic effect of IV metaraminol, an alpha-1 receptor agonist, is D) Vasoconstriction. Metaraminol is a drug that acts by activating the alpha-1 receptors, which are part of the sympathetic nervous system. This action leads to the constriction of blood vessels, thereby increasing the blood pressure. This physiological response is due to the activation of the sympathetic nervous system which typically prepares the body for 'fight or flight' situations, hence a common associated effect would be the increase of heart rate. However, metaraminol specifically targets vasoconstriction and does not directly increase heart rate.
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