Multiple Choice
True or false: if false choose the answer that best corrects the statement.
In healthy lungs, the intrapulmonary pressure is always lower than the intrapleural pressure.
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22. The Respiratory System
Pressure in the Lungs and Pleural Cavity
Multiple Choice
Pleural effusion is a condition where fluid accumulates in the pleural cavity. Which pressure or pressures would you expect to be most directly impacted by this fluid accumulation?
A
Intrapleural pressure.
B
Intrapulmonary pressure.
C
Both A & B are correct.
D
Neither pressure would be impacted.
Verified step by step guidance1
Understand the anatomy of the pleural cavity: The pleural cavity is the space between the visceral and parietal pleurae surrounding the lungs. It normally contains a small amount of lubricating fluid.
Define intrapleural pressure: Intrapleural pressure is the pressure within the pleural cavity. It is usually negative relative to atmospheric pressure, which helps keep the lungs expanded.
Define intrapulmonary pressure: Intrapulmonary pressure, also known as alveolar pressure, is the pressure within the alveoli of the lungs. It changes during breathing, becoming negative during inspiration and positive during expiration.
Analyze the effect of fluid accumulation: When fluid accumulates in the pleural cavity (pleural effusion), it can alter the normal negative intrapleural pressure, potentially making it less negative or even positive, which can affect lung expansion.
Consider the impact on pressures: Since the fluid directly affects the pleural cavity, the intrapleural pressure is most directly impacted. Intrapulmonary pressure may also be indirectly affected due to changes in lung expansion, but the primary impact is on intrapleural pressure.
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