Ureter – These narrow tubes carry urine from the kidneys to the bladder. Muscles in the ureter walls continually tighten and relax forcing urine downward, away from the kidneys. If urine backs up or is allowed to stand still, a kidney infection can develop.
Bladder – This hollow, triangular organ is located in the lower abdomen. It is supported by ligaments connected to other organs and the pelvic bones. The walls of the bladder expand and relax to hold pee, and compress and flatten to expel urine through the urethra.
Kidney – The kidneys eliminate waste and excess fluid from the body. Your kidneys also eliminate acid created by your cells and maintain a healthy balance of water, salts, and minerals in your blood, including sodium, calcium, phosphorus, and potassium.