Lung Compliance II

These flashcards cover key terms and concepts related to lung compliance, its measurement, and the mechanics of breathing.

Lung Compliance

A measure of how easily the lung can be stretched out, similar to distensibility.

Normal Lung Compliance Value

0.2 liters of air per cm H2O.

Low Lung Compliance

Characterized by a relatively small change in lung volume for a given change in pressure; associated with pulmonary fibrosis.

High Lung Compliance

Characterized by a relatively large change in lung volume for a given change in pressure; associated with emphysema.

Trans-Pleural Pressure (TPP)

The difference between alveolar pressure and pleural pressure; it determines lung expansion.

Pleural Pressure during Inspiration

Becomes more negative, causing the lung to stretch and alveoli to open.

Pleural Pressure during Expiration

Becomes less negative, contributing to lung collapse and compression of alveoli.

Inverse Relationship

Lung compliance is inversely proportional to lung recoil.

Diaphragm's Role in Breathing

Essential for generating trans-pleural pressure differences during inspiration and expiration.

Air Movement in Breathing

Air moves from high pressure (alveoli) to low pressure (atmosphere) during expiration.