Name three classes of illicit drugs and a key effect for each on the body.

• A. Opioids – analgesia and respiratory depression; Stimulants (cocaine, methamphetamine) – increased heart rate and blood pressure; Cannabis – altered perception and coordination.
• B. Opioids – increased memory; Stimulants – decreased heart rate; Cannabis – enhanced perception.
• C. Opioids – weight gain; Stimulants – sleepiness; Cannabis – appetite suppression.
• D. Opioids – liver failure; Stimulants – kidney damage; Cannabis – increased appetite.

Answer: (A)

Understanding how three common illicit drug classes affect the body.

Opioids produce analgesia by activating mu receptors to dampen pain signals, but that same action also depresses the brainstem’s respiratory centers, which can slow or stop breathing in higher doses. This combination of pain relief with a real risk of life-threatening breathing suppression is a hallmark of opioid effects.

Stimulants like cocaine and methamphetamine heighten sympathetic nervous system activity, which raises heart rate and blood pressure. This surge of activity can improve alertness and energy, but it also increases the workload on the heart and can raise the risk of cardiovascular problems, especially with heavy or prolonged use.

Cannabis, through its active component THC, disrupts normal brain signaling by acting on cannabinoid receptors. A common result is altered perception and impaired coordination and motor control, which is why tasks requiring precise timing and movement are affected.

The other options mix effects that don’t fit these drugs’ typical primary actions—for example, memory enhancement with opioids or slowed heart rate with stimulants—so they don’t match the characteristic effects described here.