Made up of the kidneys, ureter, bladder and urethra, the urinary system is responsible for the filtration, reabsorption and/or removal of dissolved organic substances and materials from the human bloodstream. Fed directly by the blood vessels of the aorta and superior vena cava, the kidneys are the first point of the urinary system. The kidneys produce urine which drains and is stored in the bladder through the ureter before being expelled through the urethra as waste. and outside the body. On average, the human bladder can hold approximately 500 ml of urine before conscious release of waste is necessary. Positioned in the lower posterior quadrant of the abdominal cavity and protected to some extent by the lower rib cage, the kidneys are about the size of a human fist. and are oval in shape. By filtering the blood that enters them, they clean the blood, remove waste toxins, maintain plasma levels by regulating blood volume and pressure, stabilize acidity levels, and preserve nutrients. The left kidney is slightly higher than the right due to the position on the back...