Depressants affect which part of the body?

Depressants primarily affect the central nervous system (CNS), which includes the brain and spinal cord. These substances work by slowing down brain activity and neural communication, leading to effects such as drowsiness, relaxation, and a reduction in anxiety. By impacting the CNS, depressants can alter an individual's mood, judgment, and coordination, making them less alert and more prone to accidents.

In contrast, while depressants may indirectly influence other body systems, their primary action is on the CNS. For instance, while the circulatory and respiratory systems may show some response to depressant use—such as slowed heart rate and decreased respiratory rate—the fundamental mechanism of action is rooted in the central nervous system. Thus, the correct choice accurately identifies the specific system that is most directly affected by depressants.