A patient with severe pneumonia has thickened alveolar walls. Which change most directly reduces oxygen transfer into the blood?
Correct answer: A. Increased diffusion distance
- A. Increased diffusion distance
- B. Increased red blood cell count
- C. Reduced airway resistance
- D. Increased pleural pressure
Explanation
Thickened alveolar walls increase the distance that oxygen must cross, so diffusion into pulmonary capillaries becomes less efficient. Gas exchange is improved by a thin respiratory membrane and adequate ventilation and perfusion.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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