In which of the following forms is/are carbon dioxide transported by the blood?
1. Chemically combined with proteins
2. Ionized as bicarbonate (HCO3–)
3. Simple physical solution
a. 2 only
b. 3 only
c. 2 and 3 only
d. 1, 2, and 3
ANS: D
Approximately 45 to 55 ml/dl of carbon dioxide is normally carried in the blood in the following three forms: (1) dissolved in physical solution, (2) chemically combined with protein, and (3) ionized as bicarbonate.
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