A 28-year-old wom an presented to the em ergency departm ent w ith breathing di culty and increasing

A 28-year-old wom an presented to the em ergency departm ent w ith breathing di culty and increasing swelling of her face, eyes, lips, and tongue. An hour earlier she had received an intram uscular injection of am picillin to treat acute pharyngitis. A diagnosis of anaphylactic reaction was m ade, and an intram uscular injection of epinephrine was given. Which of the follow ing expected e ects of the drug was m ost likely m ediated by the activation of peripheral postsynaptic a 2 receptors? A. Mydriasis B. Decreased secretion of insulin C. Increased secretion of renin D. Constriction of skin vessels E. Increased heart rate F. Dilation of skeletal m uscle vessels

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