A. The kidneys release renin, which controls angiotensin. The angiotensin controls aldosterone. Aldosterone controls the levels of Na+ and K+ B. Kidneys release aldosterone which controls renin. Renin causes the release of angiotensin. Angiotensin controls the levels of Na+ and K+ C. The kidneys release renin which controls K+. The kidneys release angiotensin which causes Na+ realease.