How does urine move from the kidneys to the urinary bladder?
A. Smooth muscle in the ureters contracts, moving urine down to the bladder. B.Transitional epithelium in the ureters contracts, moving urine down to the bladder. C. Smooth muscle in the ureters relaxes, allowing urine to fall into the bladder. D.Transitional epithelium in the ureters relaxes, allowing urine to fall into the bladder.
