Use the following key to determine the best answer. -(1) PO₂ in alveolar air (2) PO₂ in venous blood A)First item is greater than the second item. B)First item is less than the second item. C)First item is equal or nearly equal to the second item.

Question

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The PO₂ code refers to the partial pressure of oxygen (PO2) in different parts of the body. In alveolar air, the PO2 is higher than in venous blood, because oxygen is taken up from the alveoli into the blood and transported to tissues, where it is used for cellular respiration, leading to a lower PO2 in venous blood returning to the lungs.

Use the Following Key to Determine the Best Answer