What are the kidneys, ureters, and suprarenal glands? The kidneys are a pair of bean-shaped abdominal organs, which filter metabolic waste out of the blood in the form of urine. The urine then gets funneled into the urinary bladder by the ureters. Sitting on top of the kidneys, there are the suprarenal glands or adrenal glands. These glands function as a part of the endocrine system by secreting a