explain how oxygen and carbon dioxide diffuse at the alveoli. use the following words in your response: carbon dioxide, oxygen, high concentration, low concentration, energy

The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries. As a result, oxygen diffuses across the respiratory membrane from the alveoli into the blood. ... Therefore, carbon dioxide diffuses across the respiratory membrane from the blood into the alveoli. The walls of the alveoli share a membrane with the capillaries. That's how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart.

Explanation:

c. is the correct answer

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