Essential component of the renin-angiotensin system (RAS), a potent regulator of blood pressure, body fluid and electrolyte homeostasis. {ECO:0000269|PubMed:10619573, ECO:0000269|PubMed:1132082, ECO:0000269|PubMed:17138938}. [Angiotensin-2]: Acts directly on vascular smooth muscle as a potent vasoconstrictor, affects cardiac contractility and heart rate through its action on the sympathetic nervous system, and alters renal sodium and water absorption through its ability to stimulate the zona glomerulosa cells of the adrenal cortex to synthesize and secrete aldosterone (PubMed:10619573, PubMed:17138938). Acts by binding to angiotensin receptors AGTR1 and AGTR2 (PubMed:1567413). Also binds the DEAR/FBXW7-AS1 receptor (By similarity). {ECO:0000250|UniProtKB:P01015, ECO:0000269|PubMed:10619573, ECO:0000269|PubMed:1567413, ECO:0000269|PubMed:17138938}. [Angiotensin-3]: Stimulates aldosterone release. . [Angiotensin 1-7]: Is a ligand for the G protein-coupled receptor MAS1 (By similarity). Has vasodilator and antidiuretic effects. Has an antithrombotic effect that involves MAS1-mediated release of nitric oxide from platelets (By similarity). . This is the function of ENSG00000135744 (AGT, angiotensinogen).