Item Xc Wrong . D-tubocurarine modifies the pharmacological effect of acetylcholine on skeletal muscles. Before you go back to Item X, review the pharmacological effects and mechanisms of action of d-tubocurarine and other neuromuscular blocking agents. Item XVb Wrong . Item VId Wrong .
Cocaine potentiates the effects of norepinephrine.
That means that the same dose of norepinephrine will produce a greater effect in the presence of cocaine. Therefore, its blockade cannot be abolished by increasing the dose of acetylcholine. Item Vd Wrong . Isoproterenol is not less potent than norepinephrine at cardiac receptors. Go back to Item V. Item IXc Wrong .