In terms of gas exchange, what is the immediate effect of fluid accumulation in the alveoli?

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Study for the Respiratory System Test. Practice with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

In terms of gas exchange, what is the immediate effect of fluid accumulation in the alveoli?

Explanation:
When fluid accumulates in the alveoli, the barrier between air and blood becomes thicker and less distinct. Gas exchange relies on diffusion across a very thin alveolar-capillary membrane, so any increase in barrier thickness or flooding of the air spaces slows the movement of gases. The immediate consequence is a reduced rate of diffusion, meaning oxygen transfer into the blood is hindered and carbon dioxide removal is also affected—though CO2, being more soluble, might diffuse somewhat more easily than O2 initially. So the dominant effect is impeded gas exchange.

When fluid accumulates in the alveoli, the barrier between air and blood becomes thicker and less distinct. Gas exchange relies on diffusion across a very thin alveolar-capillary membrane, so any increase in barrier thickness or flooding of the air spaces slows the movement of gases. The immediate consequence is a reduced rate of diffusion, meaning oxygen transfer into the blood is hindered and carbon dioxide removal is also affected—though CO2, being more soluble, might diffuse somewhat more easily than O2 initially. So the dominant effect is impeded gas exchange.

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