The immediate precursor of norepinephrine is______________?
Correct answer: B. Dopamine
- A. Epinephrine
- B. Dopamine
- C. Tyrosine
- D. Phenylalanine
Explanation
Dopamine is hydroxylated by dopamine beta-hydroxylase to form norepinephrine. Tyrosine and phenylalanine occur earlier in the pathway, while epinephrine is formed after norepinephrine.
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