Which of the following is NOT a substance that utilizes a G protein-coupled receptor system?
A) serotonin
B) histamine
C) testosterone
D) norepinephrine
C) testosterone
Testosterone is NOT a substance that utilizes a G protein-coupled receptor system. Instead, it utilizes transcription factors for its actions. Examples of substances that do use G protein-coupled receptor systems include norepinephrine, histamine, serotonin, and many peptide hormones.
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