The urinary system consists of the kidneys, ureters, bladder and urethra. The kidneys are two bean-shaped organs
located below the ribs, in the upper abdomen. The kidneys remove excess
water and waste from the body, maintain correct balance of salts and
other substances in the blood. The kidneys also produce hormones to
maintain the calcium balance and involved in the formation of red blood
cells. Narrow tubes called ureters acts as
conduits for urine, delivering it to the urinary bladder. The urine is
finally expelled via the urethra.