Multiple Choice
Which client would a nurse monitor most closely for postoperative respiratory complications?
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22. The Respiratory System
Introduction to Lung Physiology
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Which muscles contract to decrease thoracic volume and raise intrapulmonary pressure during expiration?
A
Internal intercostal muscles and abdominal muscles
B
Sternocleidomastoid and scalene muscles
C
Pectoralis minor and serratus anterior muscles
D
Diaphragm and external intercostal muscles
Verified step by step guidance1
Understand the process of expiration: During expiration, the thoracic volume decreases, and intrapulmonary pressure increases, forcing air out of the lungs.
Identify the muscles involved in expiration: The primary muscles that contract to decrease thoracic volume are the internal intercostal muscles and the abdominal muscles.
Differentiate between muscles used in inspiration and expiration: The diaphragm and external intercostal muscles are primarily involved in inspiration, not expiration.
Consider accessory muscles: Sternocleidomastoid and scalene muscles are accessory muscles used during forced inspiration, not expiration.
Evaluate the role of other muscles: Pectoralis minor and serratus anterior muscles are involved in movements of the shoulder girdle and are not primarily responsible for expiration.
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