Three Alpha-Agonist Drugs Are Tested as Potential Vasoconstrictors

Three alpha-agonist drugs are tested as potential vasoconstrictors.  The degree of vasoconstriction is determined by measuring the cross-sectional area of an isolated vessel after application of the drug.  The following curves are obtained: Which of the following is the best statement concerning the effects of these drugs?

A) Drug 1 has lower potency than Drug 2
B) Drug 2 has higher affinity for alpha-receptors than Drug 3
C) Drug 1 demonstrates the highest efficacy
D) Drug 2 and Drug 3 bind to different loci of alpha-receptors
E) Drug 2 and Drug 3 demonstrate a similar potency

Correct Answer:

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