Autoregulation of cerebral blood flow occurs via which of the following mechanisms?
A. Blood pressure
B. Metabolite concentration
C. pH level
D. A and C only
E. All of the above
ANS: E
Rationale: Cerebral arteries regulate blood flow based on blood pressure, metabolites, and pH. Vasodilation occurs if the blood pressure or the O2 or pH levels are low or if the CO2 or lactic acid levels are elevated. Conversely, vasoconstriction occurs if the blood pressure or the O2 or pH levels are high or if the CO2 or lactic acid levels are low.
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