How the kidney and the heart regulate the blood pressure

Write an essay explaining the 3 steps that our body takes to regulate the blood from the kidney and heart. The steps from the ANP ( atrial natriuretic peptide ) are 3 and are the following: 1st step: Aldosterone, NA+ and blood volume. 2nd step: Renin-Angiotensin mechanism, and effects of angiotensin II. 3rd step: ADH and blood volume.