Final answer:
Depressants, also called narcotics, depress activity in the central nervous system by lowering neurotransmission levels. They act as agonists of the GABA neurotransmitter system.
Step-by-step explanation:
Depressants, also called narcotics, depress activity in the central nervous system. They lower neurotransmission levels and reduce arousal or stimulation in various areas of the brain. Depressants include drugs like barbiturates and benzodiazepines, which act as agonists of the GABA neurotransmitter system.