Despite the fact that the partial pressure difference is so much smaller for CO2, why is there as much CO2 exchanged between the alveoli and blood as there is O2, ?
a) CO2 is much more soluble in blood than O2.
b) The capillary walls are more permeable to CO2 than O2.
c) CO2 is a smaller molecule and diffuses faster than O2.
Answer: a) CO2 is much more soluble in blood than O2.
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