The relationship between alveolar ventilation (mL/min), carbon dioxide productio
ID: 3473087 • Letter: T
Question
The relationship between alveolar ventilation (mL/min), carbon dioxide production (mL/min), and partial pressure of carbon dioxide in the blood (mm Hg) is written below. If the alveolar ventilation increases from 500 mL/min to 1,000 mL/min and carbon dioxide production remains constant, what would be the new value for the partial pressure of carbon dioxide in the blood (assuming a starting value of P)?
*You may note that the units do not cancel because there is a constant missing that is necessary to equate dissimilar units.
Alveolar ventilation = (carbon dioxide production) / (partial pressure of carbon dioxide in blood)
The relationship between alveolar ventilation (m/min), carbon dioxide production (m/min), and partial pressure of carbon dioxide in the blood (mm Hg) is written below. If the alveolar ventilation increases from 500 mL/min to 1,000 m/min and carbon dioxide production remains constant, what would be the new value for the partial pressure of carbon dioxide in the blood (assuming a starting value of P)? You may note that the units do not cancel because there is a constant missing that is necessary to equate dissimilar units Alveolar ventilation (carbon dioxide production)/ (partial pressure of carbon dioxide in blood) 0.5P 1.0P 1.5P O 2.0PExplanation / Answer
Hi,
The equation given is,
Alveolar ventilation = CO2 production / partial pressure of CO2
It is given that Alveolar ventilation is 500
Lets sat AV1= 500
AV2 = 1000(given)
CO2 produced = x
Parial pressure = p
So, 500 = x/p at time T=0
At T=1- 1000 = x/p'
Where p' is the changed partial pressure.
Since the X has not changed and the AV has doubled, the denominator p must have reduced to half. That means the p' = p/2
Or in other words 0.5p.
Hence the answer is option A. 0.5p
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