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Partial pressure gradients of oxygen and carbon dioxide play major roles in the exchange of gas in the alveoli (external respiration) and the interstitial fluid (internal respiration).

Which of the following conditions accurately represents​ the conditions needed for oxygen to enter the bloodstream in the lungs?

A

The partial pressure of oxygen in the alveolar capillaries is 40 mmHg, ​and the partial pressure of oxygen in the alveoli is 100 mmHg.

B

The partial pressure of oxygen in the alveolar capillaries is 100 mmHg, ​and the partial pressure of oxygen in the alveoli is 40 mmHg.

C

The partial pressure of carbon dioxide in the alveolar capillaries is 45 mmHg, ​and the partial pressure of carbon dioxide in the alveoli is 40 mmHg.

D

The partial pressure of carbon dioxide in the alveolar capillaries is 40 mmHg, and the partial pressure of carbon dioxide in the alveoli is 50 mmHg.

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