In pulmonary edema, where fluid accumulation thickens the alveolar-capillary membrane, what change limits oxygen exchange, reducing arterial oxygen saturation during exercise?

💡 Explanation

Thickening of the alveolar-capillary membrane increases the diffusion distance, impairing the rate of oxygen diffusion across the membrane because Fick's Law of Diffusion dictates that diffusion rate is inversely proportional to distance. Therefore, impaired diffusion limits oxygen exchange during exercise, rather than changes in affinity, cardiac output, or surface tension.

• If a patient's pancreas is unable to produce sufficient lipase to digest lipids, which consequence follows?
• If a patient with rheumatoid arthritis experiences increased joint inflammation despite NSAID treatment, which consequence follows from elevated intra-articular cytokine levels?
• If a stroke patient receives tPA to dissolve a thrombus, but experiences subsequent brain tissue damage despite successful reperfusion, which mechanism most likely explains the paradoxical injury?
• What distinguishes the proliferative phase of the uterine cycle from the secretory phase following ovulation?
• If a patient exhibits alkalosis during surgery, which consequence related to blood oxygen transport is most likely?
• Why does a high-fiber meal promote satiety via GLP-1 secretion in the gut?