A client has a high level of carbon dioxide (co2) in the bloodstream, as measured by arterial blood gases. a nurse reviewing the client's record plans care, knowing that a high co2 level will have which effect on circulation to the brain?

It will cause vasodilation of blood vessels in the brain.

CO2 is one of the metabolic end products that can alter the tone of the blood vessels in the brain. High CO2 levels cause vasodilation, which may cause headache, whereas low CO2 levels cause vasoconstriction, which may cause lightheadedness. The statements included in the other options are incorrect effects.