Active hyperemia
A) refers to the arteriolar dilation in response to local chemical changes that accompany increased metabolic activity of the tissue
B) refers to local arteriolar mechanisms that are aimed at keeping tissue blood flow fairly constant in spite of wide deviations in mean arterial driving pressure
C) refers to the increase in blood flow to a tissue that occurs after removal of an occlusion of its blood supply
D) is important in maintaining an adequate pressure head to drive blood forward into a tissue
E) none of these
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