The epinephrine and norepinephrine released by the adrenal medullae
A)is all inactivated by enzymes in the bloodstream.
B)has a relatively long duration of activity because it may be inactivated by enzymes in the target tissues only.
C)affects its targets for only a few seconds.
D)provides for localized effects of suprarenal stimulation.
E)None of the answers are correct.

Question

Quizplus · Accepted Answer

Epinephrine and norepinephrine have a longer duration of activity because they can circulate in the bloodstream and are inactivated by enzymes in the target tissues, not immediately in the bloodstream.

The Epinephrine and Norepinephrine Released by the Adrenal Medullae