Angiotensin I
Angiotensin I
Angiotensin I (pronounced: an·gio·ten·sin | \ ˌan-jē-ō-ˈten(t)-sən \) is a peptide hormone that is part of the RAS and plays a crucial role in regulating blood pressure and fluid balance in the body.
Etymology
The term "Angiotensin" is derived from the words "angio-" meaning vessel and "-tensin" meaning tension. This refers to the hormone's function in constricting blood vessels and increasing blood pressure.
Function
Angiotensin I is produced when the enzyme Renin acts on Angiotensinogen, a protein produced by the liver and released into the bloodstream. Angiotensin I is then converted into Angiotensin II by the action of ACE, which is found in the lungs. Angiotensin II is a potent vasoconstrictor, meaning it narrows the blood vessels and increases blood pressure.
Related Terms
- Renin: An enzyme produced by the kidneys that initiates the process of angiotensin production.
- Angiotensinogen: A protein produced by the liver that is the precursor to angiotensin I.
- Angiotensin II: The active form of angiotensin that acts as a potent vasoconstrictor.
- ACE: An enzyme found in the lungs that converts angiotensin I into angiotensin II.
- RAS: A hormone system that regulates blood pressure and fluid balance.
External links
- Medical encyclopedia article on Angiotensin I
- Wikipedia's article - Angiotensin I
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