Supports Inhalation: Low pressure inside the lungs, Increasing lung volume, Contraction of the external intercostal muscles, Diaphragm contracts, Supports Exhalation: High pressure inside the lungs, Decreasing lung volume, Relaxation of the external intercostal muscles, Diaphragm relaxes, Plays a Role in Pleural Linkage: Marries the lungs to the thoracic cavity, Visceral lining of the lungs, Fluid between visceral and parietal membrane, Protects the lungs by providing a friction-free surface,

Physiology of Respiration

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