Pharmacology All India exam e9fb272f Intravenous bolus dose of a new drug produced the changes in blood pressure and hea rate as shown in the graph below. The most probable receptor affinities of this new drug are <img src=" /> A a1, a2, b1 and b2 B a1 and a2 C b1 and b2 D Muscarinic M1 and M3 High-Yield Explanation .