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Reactive Hyperemia. Reactive hyperemia is the transient increase in organ blood flow that occurs following a brief period of ischemia (e.g., arterial occlusion).hen the occlusion is released, blood flow rapidly increases (i.e., hyperemia occurs) that lasts for several minutes. The hyperemia occurs because during the period of occlusion, tissue hypoxia and a build up of vasodilator metabolites (e.g., adenosine) dilate arterioles and decrease vascular resistance.
  Reactive lymphoid hyperplasia is a condition in which the lymph tissues of the body (lymph nodes and spleen, primarily) enlarge as they respond to a viral or bacterial i â¦ nfection. The reason they enlarge has to do with the way that lymph tissues work.ymphoid tissue is found in many organs, particularly the lymph nodes, and in the lymphoid follicles associated with the digestive system such as the tonsils.