Multiple Choice
Which of the following statements accurately describes transpulmonary pressure?
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22. The Respiratory System
Introduction to Lung Physiology
Multiple Choice
What effect does contraction of the diaphragm have on the volume of the thoracic cavity?
A
It decreases the volume of the thoracic cavity.
B
It causes the thoracic cavity to collapse.
C
It increases the volume of the thoracic cavity.
D
It has no effect on the volume of the thoracic cavity.
Verified step by step guidance1
Understand the anatomy of the diaphragm: The diaphragm is a dome-shaped muscle located at the base of the lungs, separating the thoracic cavity from the abdominal cavity.
Recognize the role of the diaphragm in respiration: During inhalation, the diaphragm contracts and moves downward, which is a key action in the breathing process.
Analyze the effect of diaphragm contraction: When the diaphragm contracts, it flattens and moves downward, increasing the vertical dimension of the thoracic cavity.
Consider the relationship between volume and pressure: According to Boyle's Law, an increase in the volume of the thoracic cavity leads to a decrease in pressure, allowing air to flow into the lungs.
Conclude the effect on thoracic cavity volume: The contraction of the diaphragm increases the volume of the thoracic cavity, facilitating the process of inhalation.
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