Intrapleural pressure

Definition

Intrapleural pressure is the pressure within the pleural cavity, which is the thin fluid-filled space between the two layers of the pleura surrounding each lung. It is typically negative compared to atmospheric pressure, which helps keep the lungs inflated.

Related terms

Pleura: A double-layered membrane surrounding each lung that provides lubrication and facilitates smooth movement of the lungs during breathing.

Atmospheric Pressure: The pressure exerted by the weight of air in the atmosphere on objects within it; at sea level, it averages about 1013 millibars (or 760 mmHg).

Lung Recoil: The tendency of the elastic fibers in the lung to contract and thereby decrease lung volume after being stretched during inhalation