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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.
B) pressure receptors C) osmoreceptors D) peripheral chemoreceptors E) baroreceptors. Answer: d Level: 2 84. When carbon dioxide levels in the blood increase, the A) condition is called hypocapnia. B) pH of the blood increases. C) blood becomes more acidic. D) number of hydrogen ions in the blood decreases. E) blood becomes more alkaline. Answer: c Level: 2 85. After hyperventilating for several minutes, a person may develop short periods of apnea because A) blood pH would drop and inhibit inspiration. B) oxygen in the lungs has not had time to diffuse into the blood.