A 16-year-old m ale snorted cocaine for the rst tim e at a party. A few m inutes later he felt…

A 16-year-old m ale snorted cocaine for the rst tim e at a party. A few m inutes later he felt euphoric, and friends noted that his pupils were dilated. Which of the follow ing m olecular actions m ost likely m ediated the mydriasis? A. Inhibition of m onoam ine oxidase A B. Blockade of a2 receptors in sym pathetic term inals C. Inhibition of norepinephrine reuptake into sym pathetic term inals D. Stim ulation of epinephrine release from adrenal m edulla E. Stim ulation of norepinephrine release from sym pathetic term inals

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