A 62-year-old m an su ering from postural hypotension started therapy w ith a drug that selectively.

A 62-year-old m an su ering from postural hypotension started therapy w ith a drug that selectively activates a 1 receptors. Which of the follow ing postreceptor m echanism s m ost likely m ediated the therapeutic e ect of the drug in this patient? A. Decreased synthesis of inositol triphosphate (IP3) and diacylglycerol (DAG) B. Increased activation of phospholipase C C. Opening of ligand-gated K+ channels D. Blockade of voltage-gated Ca2+ channels E. Increased synthesis of cyclic guanosine m onophosphate (cGMP)

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