Question 1

Which structure in the brain is primarily responsible for regulating circadian rhythms in humans?

Accepted Answer

Suprachiasmatic nucleus (SCN)

Question 2

A researcher is studying the sleep patterns of adults and notes that each sleep cycle lasts approximately $$90 to$$ $$120$$ minutes. If a person sleeps for $$8$$ hours, how many sleep cycles do they typically experience?

Accepted Answer

$$4$$-$$6$$ cycles

Question 3

Which of the following best describes the EEG pattern seen during REM sleep?

Accepted Answer

Beta waves: high frequency, low amplitude

Question 4

During which sleep stage are K-complexes and sleep spindles most commonly observed on an EEG?

Accepted Answer

Stage 2

Question 5

If a person is awakened during REM sleep, which of the following physiological features are they most likely to exhibit?

Accepted Answer

Rapid eye movements and increased heart rate

Question 6

Which of the following statements about circadian rhythms is TRUE?

Accepted Answer

Circadian rhythms regulate daily changes in body temperature and hormone levels.

Question 7

A sleep researcher is analyzing EEG data and observes waves with low frequency and high amplitude. Which sleep stage is most likely being observed?

Accepted Answer

Stage 3/4 (deep sleep)

Question 8

Which of the following best defines the frequency of an EEG wave?

Accepted Answer

The number of wave cycles per second

Question 9

A patient is found to have disrupted sleep cycles, with irregular transitions between sleep stages and frequent awakenings. Which brain structure is most likely affected?

Accepted Answer

Suprachiasmatic nucleus (SCN)

Question 10

Which of the following is a distinguishing feature of Stage 2 sleep on an EEG?

Accepted Answer

Sleep spindles and K-complexes

Question 11

If a person is sleep deprived and only gets $$4$$ hours of sleep, which sleep stage is most likely to be reduced the most?

Accepted Answer

REM sleep

Question 12

Which of the following statements is FALSE regarding sleep cycles?

Accepted Answer

Stage 3/4 sleep gets longer as the night goes on.

Question 13

Which EEG feature is most difficult to distinguish from the awake state?

Accepted Answer

Stage 1

Question 14

A graduate student is analyzing EEGs and focuses on the height of the waves. What aspect of the EEG is being studied?

Accepted Answer

Amplitude

Question 15

Which of the following best describes the change in sleep stages throughout the night?

Accepted Answer

REM sleep increases as the night progresses

Question 16

Which of the following is NOT a function regulated by circadian rhythms?

Accepted Answer

Muscle paralysis during REM sleep

Question 17

Which sleep stage is characterized by the presence of delta waves on an EEG?

Accepted Answer

Stage 3/4

Question 18

A person is experiencing rapid eye movements, vivid dreams, and muscle paralysis. Which sleep stage are they most likely in?

Accepted Answer

REM

Question 19

Which of the following EEG waves has the highest frequency?

Accepted Answer

Beta waves

Question 20

Which of the following best describes the relationship between the suprachiasmatic nucleus (SCN) and the pineal gland in regulating sleep?

Accepted Answer

The SCN signals the pineal gland to release melatonin in response to darkness.

Sleep and Circadian Rhythms: Biological Foundations of Sleep

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