Ans. A. Reactive hyperemia.
Occlusion of blood flow to a region results in the buildup of metabolic products; when the flow is restored, the accumulated vasodilator metabolites produce increased blood flow.
Reactive hyperemia is the transient increase in organ blood flow that occurs following a brief period of ischemia (e.g., arterial occlusion). Reactive hyperemia occurs following the removal of a tourniquet, unclamping an artery during surgery, or restoring flow to a coronary artery after recanalization (reopening a closed artery using an angioplasty balloon or clot dissolving drug).In general, the ability of an organ to display reactive hyperemia is similar to its ability to display autoregulation.