Final answer:
In the context of inhibitory neurotransmitters for pain perception in the brain, serotonin, gamma aminobutyric acid (GABA), and norepinephrine are known to have pain-modulating effects. GABA is the main inhibitory neurotransmitter in the CNS and plays a significant role in reducing pain signals.
Step-by-step explanation:
The human body has a mechanism to reduce pain perception through the action of certain inhibitory neurotransmitters. Among the neurotransmitters listed, serotonin, gamma aminobutyric acid (GABA), and norepinephrine are known to have inhibitory effects that can modulate the perception of pain in the brain. Specifically, GABA is the main inhibitory neurotransmitter in the central nervous system (CNS), with a critical role in reducing neuronal excitability and therefore potentially lessening pain signals. It's released through various mechanisms, such as exocytosis and even passive diffusion through cell membranes. Serotonin also has roles in inhibiting pain, though it serves multiple functions in the nervous system. Norepinephrine, typically associated with the fight-or-flight response, can also inhibit pain signals as part of the body's stress response.