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Q550

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1. In an experiment, norepinephrine was injected intravenously and smooth muscle contraction was measured (control curve). Curves X, Y and Z are the result of three separate experiments, in which norepinephrine was administered shortly after an unknown pharmacological agent. What are the three most likely drugs (X,Y,Z) used in the three consecutive experiments?

A.
B.
C.
D.
E.


 

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