A) rising \[{{P}_{C{{O}_{2}}}}\]
B) rising \[{{P}_{{{O}_{2}}}}\]
C) falling \[{{P}_{C{{O}_{2}}}}\]
D) falling \[{{P}_{{{O}_{2}}}}\]
Correct Answer: B
Solution :
During inhalation, \[{{p}_{{{O}_{2}}}}\] (partial pressure of oxygen) of the alveolar air is higher than the \[{{p}_{{{O}_{2}}}}\] of blood in alveolar capillaries. Due to a \[{{p}_{{{O}_{2}}}}\] difference between air and blood, oxygen diffuses rapidly from the alveolar air into the blood of alveolar capillaries.
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