For a given minute ventilation,partial pressure of end-tidal carbon dioxide (PₑₜCO₂)is a function of which of the following?
1.Metabolic rate
2)Cardiac output
3)Alveolar dead space
4)Physiologic shunt
A) 1 and 3 only
B) 1, 2, and 3 only
C) 2, 3, and 4 only
D) 1, 2, 3, and 4

Question

Quizplus · Accepted Answer

Changes in metabolic rate cause changes in partial pressure of end-tidal carbon dioxide (PₑₜCO₂).For instance,fever and shivering increase the metabolism and increase the PₑₜCO₂.A change in cardiac output will change PₑₜCO₂ because the heart transports the blood that carries the carbon dioxide (CO₂)to the lungs for elimination.Increases in cardiac output will increase PₑₜCO₂.A change in dead space ventilation will also cause changes in the PₑₜCO₂.Increasing dead space will decrease the PₑₜCO₂.

For a Given Minute Ventilation,partial Pressure of End-Tidal Carbon Dioxide