THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -In the urinary system, the peristaltic motion is caused by a muscular contraction of the ureteral wall initiated by pacemakers. This drives urine from the kidney to the bladder through the ureter.

Detailed explanation-2: -Urine is transported out of the papilla by a peristaltic process to the pelvis and ureters and then is stored in the bladder. Peristalsis is initiated in the renal pelvis and is propagated along the urinary tract by smooth muscle cells in the ureter coat.

Detailed explanation-3: -2.5 Upper urinary tract physiology. Under normal circumstances, the peristaltic waves ensure the propulsion of the urinary bolus toward the bladder. As the urine is collected in the renal pelvis, the pelvic pressure increases and initiates a peristaltic contraction that is propagated along the ureter to the bladder.