High lung compliance means what about the pressure required to achieve a given volume?

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Multiple Choice

High lung compliance means what about the pressure required to achieve a given volume?

Lung compliance is a measure of how easily the lungs can expand for a given change in pressure. It equals the change in volume divided by the change in pressure (ΔV/ΔP). When compliance is high, the lungs stretch more easily, so you get a larger increase in volume for a smaller increase in pressure. Put simply, to reach a specific lung volume, less pressure is needed. This is affected by factors like surfactant reducing surface tension (which increases compliance) and the condition of the lung tissue itself. For example, emphysema increases compliance because the lungs become more distensible, while fibrosis decreases compliance and makes expansion harder. The other statements aren’t correct because some pressure is always required to overcome resistive and elastic forces, and pressure does influence expansion; high compliance means you need less pressure, not more.

Lung compliance is a measure of how easily the lungs can expand for a given change in pressure. It equals the change in volume divided by the change in pressure (ΔV/ΔP). When compliance is high, the lungs stretch more easily, so you get a larger increase in volume for a smaller increase in pressure. Put simply, to reach a specific lung volume, less pressure is needed.

This is affected by factors like surfactant reducing surface tension (which increases compliance) and the condition of the lung tissue itself. For example, emphysema increases compliance because the lungs become more distensible, while fibrosis decreases compliance and makes expansion harder.

The other statements aren’t correct because some pressure is always required to overcome resistive and elastic forces, and pressure does influence expansion; high compliance means you need less pressure, not more.

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