Kidney senses less volume, Renin is secreted, Angiotensinogen is converted into angiotensin I, Angiotensin-converting enzyme converts angiotensin I into angiotensin II, Angiotensin II causes blood pressure to go up with vasoconstriction, Angiotensin II ALSO triggers aldosterone to be secreted, Aldosterone causes the kidney to hold onto sodium and water, Holding onto sodium and water causes increased fluid volume and raises blood pressure

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