What does renin mean?
Renin is an enzyme produced and released by the kidneys. Its main function is to begin the renin–angiotensin–aldosterone system, a hormonal pathway that helps regulate blood pressure, sodium balance, and fluid retention. When blood pressure or blood volume falls, renin release can increase, leading to the formation of angiotensin and the production of aldosterone. This causes blood vessels to constrict and the kidneys to retain more water and sodium, helping restore circulation. Renin is therefore important in both normal physiology and the diagnosis or treatment of hypertension. In medicine, renin levels and renin activity may be measured to evaluate conditions involving blood pressure, kidney function, or the renin–angiotensin system. The term is specialized and is usually encountered in medical literature, laboratory reports, and pharmacology.
nounRenin is a proteolytic enzyme released by the kidneys that helps regulate blood pressure and fluid balance by initiating the renin–angiotensin–aldosterone system.
- An enzyme secreted by the kidney that cleaves angiotensinogen and initiates the renin–angiotensin–aldosterone system.
"The doctor ordered a renin test to investigate the patient's unusually high blood pressure."
"An excess of renin can contribute to hypertension and an increased risk of cardiovascular complications."
"The medication blocks renin activity in patients with treatment-resistant hypertension."
The plural is uncommon in ordinary writing but is used when referring to distinct forms, preparations, or measurements of renin.
"The researchers compared the renins produced by several kidney cell lines."
Renin is a kidney-made enzyme that helps the body control blood pressure by starting a hormone cascade.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does renin come from?
Renin was formed in the early 20th century from the English adjective renal, meaning “of or relating to the kidney,” together with the chemical suffix -in. Its name reflects the organ in which the enzyme is produced. The root ultimately comes through French and Latin from Latin ren, meaning “kidney,” which also underlies related forms such as renal and reniform.
Related word forms
How renin is actually used
Renin is primarily used in medical and physiological contexts. It is not normally used as a general synonym for a kidney or for hormonal activity in general.