What is the role of gas exchange in the pathophysiology of respiratory failure?

Updated: Apr 07, 2020
  • Author: Ata Murat Kaynar, MD; Chief Editor: Michael R Pinsky, MD, CM, Dr(HC), FCCP, FAPS, MCCM  more...
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Respiration primarily occurs at the alveolar capillary units of the lungs, where exchange of oxygen and carbon dioxide between alveolar gas and blood takes place. After diffusing into the blood, the oxygen molecules reversibly bind to the hemoglobin. Each molecule of hemoglobin contains 4 sites for combination with molecular oxygen; 1 g of hemoglobin combines with a maximum of 1.36 mL of oxygen.

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