Question at position 22 What is the main difference between the REM and NREM phases of sleep?REM sleep is a period of sleep characterized by rapid eye movements under closed eyelids. NREM sleep is a period of sleep characterized by slow eye movements under closed eyelids.REM sleep is a period of sleep characterized by rapid eye movements under closed eyelids. NREM sleep is a period of sleep outside of REM sleep.none of theseREM sleep is a period of sleep outside of NREM sleep. NREM sleep is a period of sleep characterized by rapid eye movements under closed eyelids.

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Let's analyze each option in turn to understand what each statement claims about REM and NREM sleep.
Option 1: 'REM sleep is a period of sleep characterized by rapid eye movements under closed eyelids. NREM sleep is a period of sleep characterized by slow eye movements under closed eyelids.' This option correctly states that REM is associated with rapid eye movements. It also correctly notes that NREM involves slower or minimal eye movements, distinguishing it from REM. However, the phrase 'NREM sleep is a period of sleep characterized by slow eye movements under closed eyelids' is a somewhat simplified characterization; while NREM does not involve the rapid eye movements seen in REM, the definition of NREM encompasses multiple stages and other physiological features beyond eye movement speed. Depending on the level of precision required, this option can be considered accurate but not as explicitly contrasting REM and NREM as option 2.
Option 2: 'REM sleep is a period of sleep characterized by rapid eye movements under closed eyelids. NREM sleep is a period of sleep outside of REM sleep.' This choice emphasizes the broader structural distinction: REM sleep occurs as a distinct phase, while NREM sleep comprises the other phases outside of REM. That captures the key difference in a concise, widely accepted way: REM is the phase with rapid eye movements, and NREM consists of sleep that is not REM. The phrasing 'outside of REM sleep' communicates that NREM and REM are separate components of sleep architecture.
Option 3: 'none of these' suggests that all previous statements are false. Given that the general descriptions of REM involving rapid eye movements are accurate, and that there is a conventional contrast with NREM, this option is not true.
Option 4: 'REM sleep is a period of sleep outside of NREM sleep. NREM sleep is a period of sleep characterized by rapid eye movements under closed eyelids.' This reverses the core characteristics: REM is not 'outside of NREM sleep' in the sense implied here, and NREM does not feature rapid eye movements as its defining trait. The combination misstates the relationship between REM and NREM and misattributes eye movement patterns to NREM, making this option incorrect.
In summary, option 1 correctly identifies rapid eye movements for REM and slower eye movements for NREM with respect to eye movement characteristics, option 2 succinctly captures the fundamental difference between REM and NREM by framing REM as the eye-movement phase and NREM as the rest of sleep, option 3 dismisses all prior statements inaccurately, and option 4 misattributes the eye movement pattern and the relationship between REM and NREM. The可信 distinction rests on eye movement patterns for REM versus NREM and the idea that REM is a distinct phase separated from NREM.

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