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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.
Vital Signs of the Planet. The global concentration of carbon dioxide in the atmosphere â the primary driver of recent climate change â has reached 400 parts per million (ppm) for the first time in recorded history, according to data from the Mauna Loa Observatory in Hawaii.arbon dioxide has increased by about 24 percent since the beginning of this record. (Source: NOAA). We rounded up a few scientists here at NASA and asked them what passing 400 ppm means to them. Passing the 400 mark reminds me that we are on an inexorable march to 450 ppm and much higher levels.