Absence of postural muscle tone is descriptive of or occurs during
A)slow-wave sleep.
B)paradoxical sleep.
C)both slow-wave sleep and paradoxical sleep.
D)neither slow-wave sleep nor paradoxical sleep.

Question

Quizplus · Accepted Answer

The absence of postural muscle tone, also known as muscle atonia, is a hallmark of paradoxical sleep (also called rapid eye movement, or REM, sleep). During paradoxical sleep, the brainstem inhibits the spinal neurons that control motor function, resulting in temporary muscle paralysis. In contrast, during slow-wave sleep (also known as non-REM sleep), there is some muscle tone and movement, although it is less frequent and vigorous than during wakefulness. Therefore, choice B is the best option.

Absence of Postural Muscle Tone Is Descriptive of or Occurs