Question
Which of the following conditions best describes the mechanism explained in the graph?
| A. |
Reactive hyperaemia
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| B. |
Active hyperaemia
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| C. |
Myogenic hyperaemia
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| D. |
Autonomic hyperaemia
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Show Answer
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Correct Answer � A
Explanation
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|
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.
