Renin-Angiotensin-Aldosterone System (RAAS) 



The kidneys produce renin in response to low blood pressure or low plasma Na concentrations.  Renin acts on angiotensin in plasma to form angiotensin I. Angiotensin I is converted to angiotensin II in the lungs by the action of angiotensin-converting enzyme (ACE). Angiotensin II acts as a hormone and a neurotransmitter on different organs to produce changes that help restore blood pressure and Na+.



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