Answer: KIDNEY (URINARY/EXCRETORY SYSTEM) helps regulate water and electrolyte balance.
Kidney is an important organ of our urinary system that regulates chemical composition of blood, regulates water and electrolyte balance, etc in our body. Kidney is made up of nephron cells that filters water, reabsorbs amino acids, secrete and excrete urine outside the body.
The second diagram best represents regeneration
