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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.
In contrast to the above observations, and in conflict with the logical explanation of mechanisms by which magnesium deficiency causes vasoconstriction and its excess causes vasodilation, there is both experimental and clinical evidence that magnesium deficiency has caused decreased blood pressure (Fig..5.3. Clinical Magnesium Deficiency and Blood Pressure. With so many magnesium-related factors influencing arterial contractility, it is not easy to select those that will precipitate either hypo-or hypertension, or produce symptomatic signs of magnesium deficiency without notably affecting the blood pressure.