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Review Question - QID 213717

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QID 213717 (Type "213717" in App Search)
A 20-year-old premedical student is observing his first surgery while shadowing when he starts to turn pale and fall to the ground. He regains consciousness after 5 seconds and says that he felt lightheaded with blurry vision just before passing out. He recovers quickly and has no residual deficits after resting briefly. During this episode, this student's heart rate slowed down and had less contractile activity. The same signaling cascade that occured in the cells of this student's heart is also activated by which of the following drugs?