Which amino acids are precursors of norepinephrine and epinephrine?

Question

Quizplus · Accepted Answer

Phenylalanine and tyrosine are the precursors of norepinephrine and epinephrine through a series of enzymatic reactions. Specifically, phenylalanine is converted to tyrosine by the enzyme phenylalanine hydroxylase, and then tyrosine is converted to L-dopa by the enzyme tyrosine hydroxylase. L-dopa is then converted to dopamine by the enzyme aromatic L-amino acid decarboxylase, and finally, dopamine is converted to norepinephrine by the enzyme dopamine beta-hydroxylase. Epinephrine is then synthesized from norepinephrine by the enzyme phenylethanolamine-N-methyltransferase (PNMT) in the adrenal medulla.

Which Amino Acids Are Precursors of Norepinephrine and Epinephrine