Respiratory & Circulatory Systems: Gas Exchange Partnership
Gas exchange is the vital partnership between the respiratory and circulatory systems:
- Respiratory System: Brings atmospheric air to alveoli. Oxygen diffuses across alveolar-capillary membrane into pulmonary capillary blood; carbon dioxide diffuses from blood into alveoli to be exhaled.
- Circulatory System: Transports oxygen-rich blood from lungs via pulmonary veins → left heart → systemic arteries → capillaries → tissues/cells. Returns CO2-rich blood via systemic veins → right heart → pulmonary arteries → lungs.
This continuous cycle—ventilation, diffusion, perfusion, diffusion, ventilation—delivers O₂ for cellular respiration (ATP production) and removes metabolic CO₂. Failure at any step (airway obstruction, alveolar damage, pulmonary embolism, heart failure, anemia) threatens life.
Regulation: Chemoreceptors (central/peripheral) monitor PaO₂, PaCO₂, pH → adjust respiratory rate/depth and cardiac output to maintain homeostasis.
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