What is the mechanism by which urine is moved downwards toward the urinary bladder?

Question

Quizplus · Accepted Answer

Urine is moved downwards towards the urinary bladder by muscular peristaltic waves. The ureters have smooth muscle fibers in their walls, which undergo rhythmic contractions that help to propel urine towards the bladder in a process called peristalsis. The contractions of the smooth muscle are controlled by both the autonomic nervous system and local chemical factors. Valves along the length of the ureter and external muscles squeezing the ureters do not play a significant role in moving urine towards the bladder. Capillary action and the effects of renin widening the ureter are not involved in urine movement.

What Is the Mechanism by Which Urine Is Moved Downwards