What is meant by compliance of the lung and how/why does reduced lung compliance (e.g. in restrictive lung diseases) decrease lung volumes?
Added by Brent B.
Step 1
It is defined as the change in lung volume per unit change in pressure. Mathematically, it can be represented as: $$ C = \frac{\Delta V}{\Delta P} $$ Where $C$ is the compliance, $\Delta V$ is the change in lung volume, and $\Delta P$ is the change in pressure. Show more…
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Madhur L.
When you breathe, a muscle (called the diaphragm) reduces the pressure around your lungs and they expand to fill with air. The table shows the volume of a lung as a function of the reduction in pressure from the diaphragm. Pulmonologists (lung doctors) define the compliance of the lung as the derivative of this function. $^{15}$ (a) What are the units of compliance? (b) Estimate the maximum compliance of the lung. (c) Explain why the compliance gets small when the lung is nearly full (around 1 liter).
Key Concept: The Derivative
Interpretations of the Derivative
What is the reason for having residual volume in the lung?
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