I know that when you hyperventilate, the Pco2 in blood decreases

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I know that when you hyperventilate, the Pco2 in blood decreases... but is it the venous or arterial PCo2 that's decreasing?
Can someone please clarify this?
Thank you!
 
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jnimagine said:
I know that when you hyperventilate, the Pco2 in blood decreases... but is it the venous or arterial PCo2 that's decreasing?
Can someone please clarify this?
Thank you!

What are your thoughts?
 
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berkeman said:
What are your thoughts?

I was initially thinking arterial CO2 because after you blow a lot of it out through hyperventilating, less CO2 would be left to go to the body... but I'm not exactly sure :S