Physiological AdaptationQuestion 2320 of 2368
Which description fits REM sleep?
- Heart rate and brain oxygen use decrease to their lowest
- It is the transition between wakefulness and sleep
- It takes up the most sleep time early in the night
- Dreaming occurs, heart rate rises, and muscles become limp
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Correct answer: Dreaming occurs, heart rate rises, and muscles become limp
In REM sleep heart and respiratory rates increase and the brain is active. Muscles go limp to prevent acting out dreams.
Source: Nursing Fundamentals, 2nd edition (Open RN, Chippewa Valley Technical College, 2024), Sleep and Rest: Sleep Phases and Stages. Licensed under CC BY 4.0.
Practice the topic "Physiological Adaptation"Questions last reviewed: 18 October 2026