Question: What classification of chemicals do dopamine, serotonin and noradrenaline belong to?
Sentence: If distinguished from reactive responses of reptiles, emotions would then be mammalian elaborations of general vertebrate arousal patterns, in which neurochemicals (for example, dopamine, noradrenaline, and serotonin) step-up or step-down the brain's activity level, as visible in body movements, gestures and postures.
Answer in sentence: yes