Final answer:
Stimulants and depressants affect the central nervous system in opposite ways to either increase or decrease neural activity.
Explanation:
Stimulants such as caffeine and amphetamines increase neural activity by blocking the reuptake of neurotransmitters in the central nervous system (CNS). Depressants like alcohol and benzodiazepines decrease consciousness by affecting neurotransmitter production. Opioids such as morphine and heroin act on opioid receptors to produce euphoria and analgesia.
Learn more about effects of stimulants and depressants on the central nervous system here:
https://brainly.com/question/39331436
