Lungs do not collapse between breaths and som | vedclass

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(B) The lungs are surrounded by the pleural membranes. The space between these membranes,known as the intrapleural space,contains a thin layer of flui

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there is a negative intrapleural pressure pulling at the lung walls

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(B) The lungs are surrounded by the pleural membranes. The space between these membranes,known as the intrapleural space,contains a thin layer of fluid. This space maintains a negative pressure (sub-atmospheric pressure) relative to the pressure inside the lungs (intrapulmonary pressure). This negative intrapleural pressure acts like a suction force that pulls the lung walls outward against the chest wall,preventing the lungs from collapsing even after a forced expiration. Consequently,a volume of air,known as the residual volume,always remains in the lungs.

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

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