How Lungs Exchange Oxygen & Carbon Dioxide
The lungs add oxygen to the blood and remove carbon dioxide via respiration. Inhalation expands the lungs, drawing air in. Oxygen diffuses across alveolar walls into capillaries; CO₂ diffuses from capillaries into alveoli to be exhaled. Oxygen-rich blood travels to the body; CO₂-rich air exits via nose/mouth.
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