Which of the following statements about the RAAS system is MOST accurate?

  1. Angiotensin I is the most potent form of the hormone and has a half-life of several hours.
  2. Renin is directly secreted by the adrenal glands in response to decreased potassium levels.
  3. Aldosterone increases sodium reabsorption in the distal convoluted tubule, leading to water retention and increased blood pressure.
  4. The RAAS system primarily acts to decrease blood pressure by vasodilation and sodium and water excretion