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I'm not sure what the mechanism is, but the nurse is only partially right. An increase in pCO2 causes vasoconstriction in the pulmonary vasculature and vasodilation EVERYWHERE else. CO2 causes constriction in the pulmonary vasculature because an increase in pC02 sends the message there is damage/shunting here, sending blood here will not effectively oxygenate it so blood is preferentially sent to a different part of the lung where it will receive better oxygenation.
The opposite of this phenomenon is vasoconstriction. During dilation, the blood vessels dilate and the bold flow increases owing to a decrease in vascular resistance. Among all the arterial dilators, CO2, the natural dilating agent, is the most powerful substance.Healthy people experience the vasodilation effect due to normal arterial CO2 concentration in their body.uring dilation, the blood vessels dilate and the bold flow increases owing to a decrease in vascular resistance. Among all the arterial dilators, CO2, the natural dilating agent, is the most powerful substance. Healthy people experience the vasodilation effect due to normal arterial CO2 concentration in their body.