![]() ![]() Your kidneys detect low salt (sodium) levels.Baroreceptors (pressure-sensitive receptors) in your arterial vessels detect low blood pressure.Specifically, renin secretion happens when: Renin is released into your bloodstream when your blood pressure drops too low or when there’s not enough sodium in your body. Aldosterone helps your kidneys retain water and salt, increasing the amount of water in your body.Angiotensin II narrows your blood vessels and stimulates the release of aldosterone.Angiotensin I is converted to angiotensin II.(Angiotensin is a hormone that narrows your blood vessels.) Renin converts angiotensinogen (a precursor of angiotensin that’s produced by your liver) to angiotensin I.It works together with angiotensin and aldosterone to manage the levels of sodium and potassium in your body. Blood pressure regulation is the main function of renin.
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