Differential effect of verapamil on excitation-contraction coupling in smooth muscle and on excitation-secretion coupling in adrenergic nerve terminals.

Acetylcholine/pharmacology Animals Calcium/antagonists & inhibitors Cats Coronary Circulation/drug effects Electric Stimulation Electrophysiology Female In Vitro Techniques Male Membrane Potentials/drug effects Muscle Contraction/drug effects Muscle, Smooth/drug effects Nerve Endings/drug effects Neuromuscular Depolarizing Agents/pharmacology Nictitating Membrane/drug effects,physiology Norepinephrine/blood,pharmacology Perfusion Potassium Chloride/pharmacology Pulmonary Artery/drug effects,physiology Rabbits Receptors, Adrenergic/drug effects Stimulation, Chemical Verapamil/pharmacology

Neuromuscular Depolarizing Agents Receptors, Adrenergic Potassium Chloride Verapamil Acetylcholine Calcium Norepinephrine