During sleep, voluntary muscle activity
A) is at its lowest during REM sleep.
B) is at its highest during REM sleep.
C) does not occur in NREM sleep.
D) does not occur during either REM or NREM sleep.

Question

Quizplus · Accepted Answer

During REM (rapid eye movement) sleep, voluntary muscle activity is at its lowest, which is why it is often called "paradoxical sleep." This is the stage of sleep where the brain is most active but the body is essentially paralyzed. In contrast, during NREM (non-rapid eye movement) sleep, there may be some muscle activity, such as shifting in bed or snoring, but it is not voluntary movement. Therefore, choices B, C, and D are incorrect.

During Sleep, Voluntary Muscle Activity