Activation of postsynaptic M2 receptors on the hea is associated with: (A) Activation of adenylyl cyclase, (B) Opening of Na+/K+ cation channels, (C) Decrease in cAMP formation, (D) Increase in IP3 and DAG
Answer is B. M2 and M4 receptors act by the opening of K+ channels. M1 and M4 act by the IP3-DAG pathway.