Which of the Following Statements Are True of the Kidneys

Which of the following statements are true of the kidneys and renin? (Read carefully and select all of the correct statements.)

A) Renin is secreted by the juxtaglomerular cells of the kidney when blood pressure rises too high.
B) One function of angiotensin II is to increase vasoconstriction.
C) The secretion of aldosterone is increased by angiotensinogen.
D) The renin-angiotensin mechanism is a negative feedback mechanism.