Why does interstitial edema impair oxygen diffusion from alveoli to pulmonary capillaries in acute respiratory distress syndrome (ARDS)?

💡 Explanation

Interstitial edema increases the distance for oxygen diffusion because fluid accumulation expands the space between the alveoli and capillaries, impeding gas exchange. Therefore, the oxygen diffusion is reduced, rather than alveolar surface tension decreasing or blood pH increasing.

• Which consequence results when undigested lactose enters colonists?
• Why does skin become more susceptible to fungal infections when sebum production is abnormally low, such as in some forms of eczema?
• A patient with pulmonary fibrosis experiences decreased arterial oxygen saturation despite supplemental oxygen. Which mechanism explains why increased inspired oxygen only partially corrects hypoxemia?
• Why does epidermal growth factor (EGF) promote keratinocyte proliferation during wound healing, rather than immediate collagen deposition?
• If a patient arrives at the emergency room experiencing an ischemic stroke and is eligible for tPA, which consequence becomes most critical regarding the penumbra's potential for recovery?
• If a muscle biopsy of a marathon runner reveals elevated intracellular lactate levels immediately after finishing a race, which consequence follows regarding muscle fiber function?