The intrapleural pressure is negative both during inspiration and expiration because
Correct Answer: Thoracic cage and lungs are elastic are elastic structure
Description: Intrapleural pressure is the pressure within the pleural cavity. Intrapleural pressure is always negative, which acts like a suction to keep the lungs inflated. The negative intrapleural pressure is due to three main factors: 1. The surface tension of the alveolar fluid Ref: guyton and hall textbook of medical physiology 12 edition page number:317,318,319
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