Which term describes drugs that depress neural activity and relieve pain, such as morphine and heroin?

• A. Stimulants
• B. Marijuana
• C. Opioids
• D. Psychoactive Drugs

Answer: (C)

Opioids are drugs that depress neural activity and relieve pain. Morphine and heroin fit this category because they bind to specific opioid receptors in the brain and spinal cord, dampening the transmission of pain signals and producing analgesia. They also slow brain activity, which can cause drowsiness and, at higher doses, respiratory depression. This mechanism sets them apart from stimulants, which boost neural activity, and from marijuana or other psychoactive drugs that affect the brain in different ways. Opioids are medically used for severe pain, but they carry risks of dependence, tolerance, and overdose, which is why their use is tightly regulated.