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In comparison to the partial pressure of oxygen (PO2) in atmospheric air:______
A. The PO2 in the alveoli is the same due to diffusion.
B. The PO2 in the alveoli is lower because some air stays in the lungs at the end of expiration.
C. The PO2 of the arterial blood is higher.
D. The partial pressure of CO2 in atmospheric air is higher.
E. The PO2 of the venous blood is higher.

Respuesta :

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Answer:

D. The partial pressure of CO2 in atmospheric air is higher.

E. The PO2 of the venous blood is higher.

Explanation:

luisvaschetto

In comparison to the partial pressure of oxygen (PO2) in atmospheric air, the PO2 in the alveoli is lower because some air stays in the lungs at the end of expiration (Option B).

  • During inspiration, oxygen enters the lungs and reaches the air sacs known as alveoli, which are responsible for gas exchange (oxygen and carbon dioxide exchange).

  • The oxygen then passes to the red blood cells, which are responsible for transporting this element to all body cells in order to be used during cellular respiration.

  • During expiration, red blood cells containing carbon dioxide (which is a waste product of cellular respiration) reach the lungs, where it passes into the alveoli to be exhaled.

  • During these processes, the PO2 in tissues is very low (approx 40 mm Hg), because oxygen is continuously being used for cellular respiration.

  • During exhalation, the extra oxygen that could enter into the blood cells during inspiration moves out, thereby increasing its PO2 (maximum partial pressure= 115 mmHg).

In conclusion, in comparison to the partial pressure of oxygen (PO2) in atmospheric air, the PO2 in the alveoli is lower because some air stays in the lungs at the end of expiration (Option B).

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