. "The process in which angiotensinogen metabolites in the bloodstream modulate the force with which blood passes through the circulatory system. The process begins when renin is released and cleaves angiotensinogen." . . "regulation of systemic arterial blood pressure by circulatory renin-angiotensin" . "circulatory renin-angiotensin blood pressure regulation" . "circulatory renin-angiotensin control of blood pressure" . "circulatory renin-angiotensin regulation of blood pressure" . "control of blood pressure by circulatory renin-angiotensin" . "renin-angiotensin blood pressure control" . . . . .