This graph illustrates the dose-response relationship for the effect of the beta agonist isoproterenol on an isolated perfused heart, both alone and in the presence of different fixed concentrations of Drug X. Based upon the data shown, Drug X is most likely a(n) : 
A) beta agonist
B) competitive antagonist
C) irreversible antagonist
D) noncompetitive antagonist
Correct Answer:
Verified
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