USMLE Step 1 Quiz
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RESPIRATORY SYSTEM
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A patient with end-stage chronic obstructive pulmonary disease (COPD) has chronic respiratory acidosis due to impaired gas exchange. An arterial blood gas analysis shows a PCO₂ of 65 mmHg. The body must transport this excess CO₂ from the tissues to the lungs.
Even in this pathological state of hypercapnia, the vast majority of the CO₂ in the patient's arterial and venous blood is transported in which form?
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