Sometimes condensed into less than seven functions, the human urinary system acts to remove the waste products of urea and uric acid, regulate electrolytes, regulate the pH of blood, control blood volume, maintain blood pressure and expel other processed waste at the end of the system. The human urinary system, also called the renal system, is primarily composed of two kidneys that act as filters in the human body.
The renal system is meant to expel the excretions of the kidneys, which is waste that the kidneys have filtered out of the blood from chemicals brought in by the lungs, skin and intestines. The kidneys maintain the healthy balance of chemicals in a person's blood, usually those that help other parts of the body function.
Renal or urinary diseases can interfere with the function of the kidneys and other urinary system components. Urinary tract infections can cause inflammation or damage to any part of the urinary system, requiring antibiotics to treat. Renal disease, a far more serious condition, can cause renal failure, requiring dialysis to pick up the slack of the failing kidneys. Sometimes a kidney transplant is necessary to get the blood filtered properly again without the outside help of dialysis.