Physiology

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

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

Change in a direction opposite the change in mean aerial pressure

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

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