The physiology of sleep is complex. Which of the following is the most appropriate statement in regard to this process?
1. Ultradian rhythms occur in a cycle longer than 24 hours.
2. Nonrapid eye movement (NREM) refers to the cycle that most clients experience when in a high-stimulus environment.
3. The reticular activating system is partly responsible for the level of consciousness of a person.
4. The bulbar synchronizing region (BSR) causes the rapid eye movement (REM) sleep in most normal adults.
ANS: 3
The ascending reticular activating system (RAS) located in the upper brain stem is believed to contain special cells that maintain alertness and wakefulness. Infradian rhythms, not ultradian rhythms, occur in a cycle longer than 24 hours. Nonrapid eye movement refers to the sleep cycle that most clients experience in a low-stimulus environment. The bulbar synchronizing region is the area of the brain where serotonin is released to produce sleep. It is not responsible for REM sleep.
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