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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.
BREATHING carbon dioxide raises the. blood pressure and hyperventilation. lowers it in man and experimental. animals. Changes in blood carbon dioxide are. supposed to affect vessels both directly and. by way of the vasomotor centers.' These. actions are thoughtto be opposite in direction, with the central effect being the stronger. That is, a high carbon dioxide level causes an. over-all vasoconstriction because of its effect.