At 37° C and 760 mm Hg pressure, 0.023 ml of O2 can be dissolved in 1 ml of plasma, whereas at the same temperature and pressure, 0.510 ml of CO2 will dissolve in 1 ml of plasma. What ex-plains this difference?
a. CO2 diffuses more rapidly than O2.
b. CO2 is more soluble in plasma than O2.
c. CO2 has a greater molecular weight than O2.
d. O2 has less affinity for plasma than CO2.
ANS: B
For example, the solubility coefficient of O2 in plasma, at 37° C and 760 torr pressure, is 0.023 ml/ml. Under the same conditions, 0.510 ml of CO2 can dissolve in 1 ml of plasma.
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