Multiple choice Which of the following groups of chemicals include neuro-transmitters? Somatostatin, serotonin, acetylcholine Nor-adrenaline, somatostatin, threonine Glycine, dopamine, melatonin Acetylcholine, nor-adrenaline, dopamine Reveal answer Fill a bubble to check yourself D Correct answer Explanation Acetylcholine, nor-adrenaline, dopamine are all neurotransmitters.