The blood flowing towards the lungs contains more of which of the following compared to the blood flowing away from the lungs?
- AOxygen
- B$CO_2$
- CHydrogen
- D$pH$
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| Column-$I$ | Column-$II$ |
|---|---|
| $A$. Alveoli | $i$. $0.3 \ mmHg \ PCO_2$ |
| $B$. Deoxygenated blood | $ii$. $45 \ mmHg \ PCO_2$ |
| $C$. Atmospheric air | $iii$. $104 \ mmHg \ PO_2$ |
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