Which of the following statements is true of REM sleep?Multiple ChoiceIt occupies a little more than 20 percent of adults' total sleeping time.Breathing rate decreases during this period.It is characterized by decreased heart rate and the absence of dreams.The activity of skeletal muscles increases during this period.
Question
Which of the following statements is true of REM sleep?Multiple ChoiceIt occupies a little more than 20 percent of adults' total sleeping time.Breathing rate decreases during this period.It is characterized by decreased heart rate and the absence of dreams.The activity of skeletal muscles increases during this period.
Solution
The statement that is true of REM sleep is: "It occupies a little more than 20 percent of adults' total sleeping time."
Here's why:
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REM (Rapid Eye Movement) sleep is a stage of sleep where the brain is very active and dreams often occur. It is estimated to occupy about 20-25% of an adult's sleep cycle, which makes the first statement true.
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Breathing rate actually tends to increase during REM sleep, not decrease. This is because the brain is very active during this stage.
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While heart rate can vary during REM sleep, it is not characterized by a decreased heart rate and the absence of dreams. In fact, it's quite the opposite. Dreams are most likely to occur during REM sleep, and the heart rate can actually increase.
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The activity of skeletal muscles does not increase during REM sleep. In fact, major voluntary muscle groups, such as those in the arms and legs, are actually paralyzed during REM sleep. This is thought to be a mechanism to prevent us from acting out our dreams.
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