Oxygen's Journey: From Inhalation to Cellular Respiration
- Inhalation: O₂ enters via nose/mouth.
- Alveolar diffusion: Crosses alveolar-capillary membrane.
- Hemoglobin binding: Forms oxyhemoglobin in RBCs.
- Circulatory transport: Heart pumps oxygenated blood systemically.
- Capillary-tissue diffusion: O₂ moves into cells.
- Cellular respiration: O₂ + glucose → ATP + CO₂ + H₂O in mitochondria.
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