What Stops Oxygen from Diffusing Back into the Lungs After

question 68

Multiple Choice

What stops oxygen from diffusing back into the lungs after it is in the blood?

• A) Diffusion slows once there are equal concentrations in the blood and lungs.
• B) The oxygen levels in the alveoli and blood move toward equilibrium.
• C) The blood is flowing past the alveoli in capillaries and out to the heart.
• D) Oxygen does diffuse back into the lungs in small amounts,but the overall movement of oxygen is from the high concentration in the lungs to the low concentration in the blood.
• E) All of the answers are correct.

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