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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

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

Which of the following occupies the greatest proportion of the total sleep time?

A. Stage N1 non-REM sleep

B. Stage N2 non-REM sleep

C. Stage N3 non-REM sleep

D. REM sleep

Summary Introduction

Introduction:

Sleep can be defined as a partially unconscious state where both the physical and mental functions of the body are reduced. The sleep cycle consists of various stages of sleep, where each stage has a different role and time duration. Also, sleep cycle varies with the age.

Explanation

Justifications/ Explanations for the correct answer:

Option (b) is given as stage N-2 non-REM sleep. The stage N-2 non-REM sleep occupies the greatest proportion of the total sleep time. A healthy individual has to pass through all the sleep stages to complete a sleep cycle. The stage N-2 non-REM (non-rapid-eye-movement) is a light sleep state that involves relaxation of the major body system. This stage comprises about 40 to 50 percent time of a sleep cycle and thus, occupies the greatest proportion of the sleep cycle. Hence, option (b) is correct.

Explanation for the incorrect answer:

Option (a) is given as stage N-1 non-REM sleep. The N-1 stage of the non-REM cycle precedes the N-2 stage and it is also a light form of sleep. The N-1 stage is short-lived and can be broken easily by an external stimulus...

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