As aerial pressure is raised and lowered during the course of a day, blood flow through the brain would be expected to

A. Change in the same direction as the aerial blood pressure because of the limited autoregulatory ability of the cerebral vessels

B. Change in a direction opposite the change in mean aerial pressure

C. Remain constant because cerebral vascular resistance changes in the same direction as aerial pressure

D. Fluctuate widely, as both aerial pressure and brain neural activity status change

Correct Answer: Remain constant because cerebral vascular resistance changes in the same direction as aerial pressure

Description: Brain blood flow is constant despite large changes in the aerial blood pressure because vascular resistance usually changes in the same direction as the aerial pressure and by almost the same percentage.Ref: Guyton; 13th edition

Category: Physiology

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