Diffusion capacity CO2 v.s O2

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username459260
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#1
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#1
Hi again
I know that the rate of diffusion of CO2 out of the blood is 20* greater than that of oxygen BUT this does not seem to make much logical sense.
If CO2 is more soluble in plasma than oxygen surely it should be less likely to diffuse OUT of the plasma than oxygen to diffuse in?
Thank you
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thegodofgod
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#2
Report 8 years ago
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(Original post by jsmith6131)
Hi again
I know that the rate of diffusion of CO2 out of the blood is 20* greater than that of oxygen BUT this does not seem to make much logical sense.
If CO2 is more soluble in plasma than oxygen surely it should be less likely to diffuse OUT of the plasma than oxygen to diffuse in?
Thank you
Pharmacologically speaking, a molecule has to be dissolved (be in solution) in order to diffuse across a biological membrane; molecules which are not dissolved cannot cross such membranes. Since CO2 is more soluble in plasma than O2, it means that more CO2 would dissolve in plasma than O2, and therefore, more CO2 would diffuse out of the blood vessels than O2.
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username459260
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#3
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#3
(Original post by thegodofgod)
Pharmacologically speaking, a molecule has to be dissolved (be in solution) in order to diffuse across a biological membrane; molecules which are not dissolved cannot cross such membranes. Since CO2 is more soluble in plasma than O2, it means that more CO2 would dissolve in plasma than O2, and therefore, more CO2 would diffuse out of the blood vessels than O2.
thanks I never knew that
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