Answer :
Answer:
The PO₂ of alveolar air is 40 mmHg. The blood entering the pulmonary capillaries has a PO₂ of 100 mmHg, and the blood leaving the pulmonary capillaries has a PO₂ of 159 mmHg.
The correct answer is: b) 40; 100; 159
Explanation:
1. The PO₂ of alveolar air is around 100 mmHg.
2. The blood entering the pulmonary capillaries has a lower PO₂ compared to the alveolar air, which is around 40 mmHg.
3. The blood leaving the pulmonary capillaries has a higher PO₂ compared to the blood entering, which is around 159 mmHg.
This sequence represents the process of gas exchange that occurs in the lungs where oxygen moves from the alveolar air into the bloodstream and carbon dioxide moves from the bloodstream into the alveolar air.
The correct answer is: b) 40; 100; 159
