Endocrinology

 

The Renin-Angiotensin System (RAS) is a hormone system that regulates blood pressure and fluid balance in the body. It plays a crucial role in maintaining cardiovascular and renal function. Here's how it works: Key Components: Renin : This enzyme is produced by the kidneys in response to low blood pressure, low sodium levels, or sympathetic nervous system activation. It converts angiotensinogen (a protein produced by the liver) into angiotensin I. Angiotensin I : A relatively inactive molecule that is converted into angiotensin II by the Angiotensin-Converting Enzyme (ACE) , primarily in the lungs. Angiotensin II : This is the most active form and has multiple effects: Vasoconstriction : It causes blood vessels to narrow, increasing blood pressure. Aldosterone Secretion : It stimulates the adrenal glands to release aldosterone, which promotes sodium and water retention by the kidneys, further increasing blood volume and pressure. ADH Release : It can stimulate the release of Antid...