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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.
Best Answer: As far as I know, carbon dioxide doesn't directly effect blood pressure and pulse rate. Blood oxygen levels are the primary determinate of those vital stats. Blood carbon dioxide levels primarily change the pH of blood and regulate the breathing reflex.I suppose that if your blood CO2 levels get too high, your respiration rate would increase.This increase would keep changing the pressure in the thoracic cavity, increasing venous return in the vena cava.he rate and depth of your breathing will increase as a result of the increase in CO2. (Accumulation of CO2 can occur drastically during periods of heavy activity). Especially during exercise, your body wants to get rid of this CO2 (because this makes the blood more acidic), and gain more oxygen.