The physiology of sleep is complex. Which of the following is the most

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.

ANSWER

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.