1. A 68-year-old m an recently diagnosed w ith atrial brillation started therapy w ith atenolol, a..

1. A 68-year-old m an recently diagnosed w ith atrial brillation started therapy w ith atenolol, a ß-receptor blocker. Which of the follow ing changes m ost likely occurred in cardiac myocytes during the rst 2 weeks of therapy? A. Spare ß receptors becam e activated. B. The G-protein num ber decreased. C. The ß-receptor num ber increased. D. Most ß receptors becam e phosphorylated. E. The ability to respond to intracellular cyclic adenosine m onophosphate (cAMP) declined.

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