James has been sleeping for about 90 minutes when his brain shows rapid,irregular waves.His blood pressure rises,his heart rate increases,and his skeletal muscles go limp.Which of the following is the most likely conclusion?
A)James is chronically sleep deprived and his sleep,like his daytime activities,is abnormal.
B)James is experiencing physiological changes that are normal for the third stage of sleep.
C)James is experiencing unusual sleep because earlier he engaged in strenuous physical activities.
D)James is experiencing physiological changes that are normal during paradoxical sleep.

Question

Quizplus · Accepted Answer

The symptoms described are typical of paradoxical sleep, also known as REM (rapid eye movement) sleep. During this stage, the brain becomes more active and similar to that of when it is awake, while the body experiences muscle atonia (limpness). The increase in heart rate and blood pressure is also typical of this stage. Therefore, the most likely conclusion is that James is experiencing physiological changes that are normal during paradoxical sleep.

James Has Been Sleeping for About 90 Minutes When His