meenaxi
AIPPG Experienced Senior Member
Joined: 21 Feb 2009
Posts: 1637
74606 Credits
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 Posted: Tue Nov 03, 2009 1:16 pm Post subject: In exercise, how does the venous blood Po2 and pCO2 change |
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In exercise, how does the venous blood Po2 and pCO2 change
1. no change
2. Po2 decrease, pCo2 increase
3. pO2 no change, pcO2 increase
4. Po2 decrease, pco2 no change
In exercise, lung will thus have
1. high vascular resistance, high pulmonary blood pressure
2. low vascular resistance, high pulmonary blood pressure
3. high vascular resistance, low pulmonary blood pressure
4. low vascular resistance, high pulmonary blood pressure
In exercise, lung will have
1. limited perfusion
2. limited diffusion
3. normal perfusion and diffusion
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meenaxi
AIPPG Experienced Senior Member
Joined: 21 Feb 2009
Posts: 1637
74606 Credits
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| Posted: Tue Nov 03, 2009 1:16 pm Post subject: |
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lung is different from the rest of the body in terms of response to po2 and pco2
decrease po2 and increase pco2 usually dilate BV, but in lung, it will constrict to balance the V/Q
In exercise, you will have a larger CO, thus you will need to held more blood in the lung
In exercise, blood flows faster, so it will have less time for the gas exchange to happen in the lung
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