View source for Hyperaemia

{{Mergefrom|Functional hyperemia|discuss=Talk:Hyperemia#Merger|date=September 2008}}
{{Mergefrom|Reactive hyperemia|discuss=Talk:Hyperemia#Merger|date=September 2008}}

{{Infobox Disease |
  Name           = Hyperaemia |
  Image          = |
  Caption        = |
  DiseasesDB     = 4466 |
  ICD10          = |
  ICD9           = {{ICD9|780.99}} |
  ICDO           = |
  OMIM           = |
  MedlinePlus    = |
  eMedicineSubj  = |
  eMedicineTopic = |
  MeshID         = D006940 |
}}
'''Hyperaemia''' or '''hyperemia''' describes the increase of blood flow to different tissues in the body. It can have medical implications, but is also a regulatory response, allowing change in blood supply to different tissues through [[vasodilation]].

== Hyperaemia and the regulation of blood flow ==
[[Functional hyperemia|Functional hyperaemia]] is an increase in blood flow to a tissue due to the presence of metabolites and a change in general conditions. When a tissue increases activity there is a well characterized fall in the partial pressure of oxygen and pH, an increase in  partial pressure of carbon dioxide, and a rise in temperature and the concentration of potassium ions. The mechanism for [[vasodilator|vasodilation]] is unclear, but it may have something to do with the opening of [[precapillary sphincter]]s.

[[Functional hyperemia|Active hyperaemia]] is a term used to describe dilation of [[arterioles|arteriolar]] [[smooth muscle]] to increase blood flow in response to an increase in [[metabolism]].This can also occur due to the fall in atmospheric pressure.

[[Reactive hyperemia|Reactive hyperaemia]] is a profound increase in blood flow to an organ after being [[Vascular occlusion|occluded]] due to a shortage of oxygen and a build-up of metabolic waste.

==External links==
*[http://www.cvphysiology.com/Blood%20Flow/BF005.htm Active] and [http://www.cvphysiology.com/Blood%20Flow/BF006.htm reactive] hyperemia. Richard E. Klabunde, Ph.D. Cardiovascular Physiology Concepts. Accessed on 27 February 2006.

{{Cardiovascular system symptoms and signs}}

[[Category:Symptoms and signs: Circulatory and respiratory systems]]

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