paheli
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Compared with the apex of the lung, the base of the lung has
A. a higher pulmonary capillary PO2
B. a higher pulmonary capillary PCO2
C. a higher ventilation/perfusion (V/Q) ratio
D. the same V/Q ratio
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| icandoittoo
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B
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| unique1
InGodITrust
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B
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| paheli
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yep, you guys got it. B it is. anybody care to explain why?
admittedly an easy qn. will post more demanding ones in future.
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| i_m_legend
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alveolar O2 tension changes by more than 40 mm Hg from apex to base while CO2 and N2 tensions change by about 14 and 29 mm Hg, respectively. Maximal differences in O2 saturation of end-capillary blood are 4% but differences in CO2 contents of 7 vol % and pH variations of 0.12 units occur. The O2 uptake per unit lung volume increases eightfold down the lung while corresponding variations in CO2 output are less than threefold. N2 passes out of the blood in upper parts of the lung but into the blood in basal regions (net exchange is zero). Over-all O2 uptake and CO2 outputs are reduced by only 2–3% by the ventilation-perfusion ratio inequality, causing alveolar-arterial differences of 4, 1, and 3 mm Hg for O2, CO2, and N2, respectively.
This is just extra piece of information!
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| paheli
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i_m_legend wrote:
The O2 uptake per unit lung volume increases eightfold down the lung while corresponding variations in CO2 output are less than threefold.
yep, that's the gist of it.
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Prepare as if you're the worst, Perform as if you're the best! As you dream, so you manifest. So, DREAM BIG!! When you face hardship, remember, God never gives you more than you can handle. Keep your face to the sunshine and you cannot see the shadows.
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