Multiple Choice
What is the primary function of the trachea in the respiratory system?
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22. The Respiratory System
Introduction to Lung Physiology
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Which of the following muscles is involved in normal quiet inspiration?
A
Rectus abdominis
B
Sternocleidomastoid
C
Diaphragm
D
Internal intercostal muscles
Verified step by step guidance1
Understand the process of normal quiet inspiration, which is the act of drawing air into the lungs without any forceful effort.
Identify the primary muscles involved in this process. The diaphragm is the main muscle responsible for normal quiet inspiration.
Recognize that during inspiration, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity and decreasing the pressure inside, allowing air to flow into the lungs.
Consider the role of other muscles listed: the rectus abdominis and internal intercostal muscles are not primarily involved in quiet inspiration. The sternocleidomastoid is involved in forceful inspiration, not quiet inspiration.
Conclude that the diaphragm is the correct muscle involved in normal quiet inspiration, as it is the primary muscle facilitating this process.
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