Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Sleep spindles first appear in which of the following?

A. Stage N1 non-REM sleep

B. Stage N2 non-REM sleep

C. Stage N3 non-REM sleep

D. REM sleep

Summary Introduction


The electroencephalogram (EEG) is used to measure the electrical activity in the brain. It is measured by frequency, amplitude, and the polarity of the brain waves. Sleep spindles are defined as brain waves formed from a burst of brain activity while the patient is asleep. The waves are in the range of 12-14 Hz frequency and last for a relatively short period of time.


Justifications/ Explanations for the correct answer:

Option (b) is given as stage N-2 non-REM sleep. The sleep spindles play a major role in inhibiting mental processing and help the brain to proceed to a deeper sleep stage. The transition from stage N-1 non-REM (non-rapid-eye-movement) sleep to stage N-2 non-REM sleep is marked by the presence of sleep spindles. Hence, option (b) is correct.

Explanation for the incorrect answer:

Option (a) is given as stage N-1 non-REM sleep. The brain waves that are commonly found in the N-1 stage are alpha waves and theta waves. The body is in a semi-conscious state during this stage and does not show the presence of sleep spindles...

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