A 75-year-old-wom an, hospitalized for breast cancer, was found unconscious in her bed by a nurse. A

A 75-year-old-wom an, hospitalized for breast cancer, was found unconscious in her bed by a nurse. A diagnosis of cardiac arrest was m ade, and cardiopulm onary resuscitation was started w ithout success. The electrocardiogram showed that the patient was in asystole. An intracardiac injection of epinephrine was given. Which of the follow ing postreceptor m echanism s m ost likely m ediated the e ect of epinephrine on cardiac contractility in this patient? A. Opening of ligand-gated K+ channels B. Opening of ligand-gated Na+ channels C. Activation of phospholipase C D. Activation of phospholipase A2 E. Activation of adenylyl cyclase

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