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OPRA Pharmacology and Toxicology QUESTION #3855
Question 1
Which of the following substances does NOT function as a neurotransmitter within the central nervous system?
  • Serotonin
  • Noradrenaline
  • Dopamine
  • Cyclic adenosine phosphate✔️
Correct Answer Explanation
Cyclic AMP (cAMP) is a second messenger involved in intracellular signal transduction but is not itself a neurotransmitter.