The ventilation-perfusion ratio R_VP is the ratio of the ventilation and perfusi
ID: 178460 • Letter: T
Question
The ventilation-perfusion ratio R_VP is the ratio of the ventilation and perfusion rates. (i) What would happen to the partial pressures of oxygen and carbon dioxide if ventilation is reduced to the partial pressures of oxygen and carbon dioxide if ventilation is reduced to zero due to blockage but the perfusion rate remains the same? (ii) What would be the effect if the blood flow is obstructed but the ventilation rate remains the same? (b) The arterio-venous concentration difference of oxygen is 5 ml per 100 ml of blood. Given that the alveolar partial pressure of carbon dioxide is 40 mm Hg and the respiratory exchange ratio is 0.8, calculate the ventilation-perfusion ratio.Explanation / Answer
a) i- smaller volumes can be exchanged and shunt process will takes place
ii- no amount of gases exchange will not takes place and dead space can takes place.
b) 0.8 calculation is not really useful to calculate the ventilation- perfusion ratio
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