Answer:
kidney
Explanation:
Kidney is the main organ which regulate the body fluids in the body and also waste material like urea, hydrogen ion and salts. Antidiuretic hormone helps in water absorption in the kidneys.
Aldosterone is released from kidney to regulate the sodium levels in the blood. Kidney filters the blood and regulate the salts, water , hydrogen ions and urea so the extra waste material can be excreted and blood remains pure.
