A 53-year-old m an was brought to the em ergency departm ent after su ering crushing substernal pain

A 53-year-old m an was brought to the em ergency departm ent after su ering crushing substernal pain for the past hour. Vital signs on adm ission were blood pressure 88/50, pulse 115 bpm , respirations 30/m in. Further exam s led to the diagnosis of cardiogenic shock due to myocardial infarction, and therapy was started that included an intravenous infusion of an appropriate drug. Which of the follow ing m olecular actions m ost likely m ediated the therapeutic e ectiveness of the drug in this patient? A. Activation of phospholipase A2 B. Increased synthesis of inositol triphosphate (IP3) and diacylglycerol (DAG) C. Increased synthesis of cyclic adenosine m onophosphate (cAMP) D. Increased synthesis of cyclic guanosine m onophosphate (cGMP) E. Opening of ligand-gated Na+ channels F. Opening of ligand-gated K+ channels

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