Which of the following effects can be expected from taking a depressant?

Taking a depressant is known to produce effects that inhibit central nervous system activity. One of the primary effects of depressants is the relaxation of muscles. Depressants, such as alcohol, benzodiazepines, and barbiturates, work by enhancing the activity of neurotransmitters that promote relaxation and reduce anxiety. This results in a calming effect on both the mind and body, leading to muscle relaxation, which is part of the overall depressant effect.

The other options imply effects that are typically associated with stimulants rather than depressants. Increased alertness, heightened awareness, and increased sociability are characteristics more aligned with the effects of stimulants, which serve to energize and heighten cognitive functioning. In contrast, depressants generally reduce activity levels, slow down responses, and induce a feeling of calm or sedation. Hence, the relaxation of muscles is the accurate and expected outcome from taking a depressant, highlighting how these substances influence the body's systems.