Researchers Study the Effects of Serotonin Depletion in Human Subjects

Multiple Choice

Researchers study the effects of serotonin depletion in human subjects by

A) using the synthesis blocking drug PCPA.
B) administering a special milkshake that is rich in tryptophan hydroxylase.
C) injecting subjects with insulin to alter the ratio of amino acids in the blood.
D) administering a cocktail of amino acids that compete with tryptophan for entry into the brain.