Final answer:
Aldosterone acts on most cells in the body, particularly enhancing the reabsorption of sodium ions in the kidneys. ADH regulates water excretion by causing water reabsorption in the kidney tubules.
Step-by-step explanation:
Aldosterone acts on most cells in the body, but it is particularly effective at enhancing the rate of reabsorption of sodium ions in the kidney tubules and increasing the secretion of potassium ions and/or hydrogen ions. ADH, also known as antidiuretic hormone, acts on the kidneys to regulate the amount of water excreted. It causes direct water reabsorption from the kidney tubules by temporarily inserting water channels, aquaporins, into the kidney tubules.