- Respiration (breathing) is driven by pressure differences between the lungs and the atmosphere. - Inspiration occurs when intrapulmonary pressure is lower than atmospheric pressure (diaphragm contracts, thoracic cavity expands). - Expiration occurs when intrapulmonary pressure is higher than atmospheric pressure (diaphragm relaxes, thoracic cavity volume decreases). - The diaphragm contracts during inspiration, not expiration (except forced expiration).
During expiration the air will leave the lungs when the pressure inside the lungs must become
Asked in HAS Prelims 2021 · Topic: Respiratory System (Mechanism of Breathing: Inspiration and Expiration)
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