37. REM sleep is characterized by:

A. Muscle tone and dreaming
B. Muscle atonia and dreaming
C. Slow-wave activity
D. K-complexes

Question

37. REM sleep is characterized by:

A. Muscle tone and dreaming
B. Muscle atonia and dreaming
C. Slow-wave activity
D. K-complexes

BlackTom AI · Accepted Answer

The question asks us to identify the characteristic features of REM sleep from the given options.
Option A: 'Muscle tone and dreaming' — This is not accurate for REM sleep. During REM, muscle tone is suppressed (atonia) to prevent acting out dreams, so 'muscle tone' is incorrect in this context. Additionally, dreaming is commonly reported during REM, but the combination here mismatches the hallmark muscle atonia.
Option B: 'Muscle atonia and dreaming' — This pairing aligns with the classic REM sleep profile: active brain activity with dream experience, coupled with near-total muscle atonia that prevents movement. The presence of dreaming complements the brain's vivid REM phenomena, while the motor system remains inhibited.
Option C: 'Slow-wave activity' — Slow-wave activity characterizes deep NREM sleep (especially Stage 3, a.k.a. slow-wave sleep), not REM. REM sleep is marked by relatively desynchronized, mixed-frequency EEG activity rather than the high-amplitude, low-frequency slow waves seen in deep NREM.
Option D: 'K-complexes' — K-complexes are prominent features of N2 (the second stage of NREM sleep) and can occur during transitions into deeper sleep. They are not characteristic of REM sleep, which features rapid eye movements, EEG activation, and atonia rather than the K-complex morphology.
Taken together, the descriptions align with REM sleep's distinctive combination of dreaming with muscle atonia and not with the other listed sleep features. Each incorrect option draws attention to phenomena associated with other sleep stages or misstates REM properties, highlighting common misconceptions about sleep stage physiology.

37. REM sleep is characterized by: A. Muscle tone and dreaming B. Muscle atonia and dreaming C. Slow-wave activity D. K-complexes 单项选择题

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