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Which one of the following statements about blood constituents and transport of respiratory gases is most accurate?

1. RBCs transport oxygen whereas WBCs transport CO2.
2. RBCs transport oxygen whereas plasma transports only CO2.
3. RBCs as well as WBCs transport both oxygen and CO2.
4. RBCs as well as plasma transport both oxygen and CO2.

Correct answer: RBCs as well as plasma transport both oxygen and CO2.

Solution

Red blood cells carry most oxygen via hemoglobin, but plasma also carries a small amount of dissolved oxygen. Carbon dioxide is transported in several forms, including dissolved in plasma and as bicarbonate, so plasma is involved too. Thus both RBCs and plasma participate in transporting both gases.

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