THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -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-2: -Peristalsis is a series of muscle contractions. These contractions occur in your digestive tract. Peristalsis is also seen in the tubes that connect the kidneys to the bladder. Peristalsis is an automatic and important process.

Detailed explanation-3: -Flow of urine through the ureter: a collapsible, muscular tube undergoing peristalsis.

Detailed explanation-4: -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. The peristaltic wave can move urine against an obstacle, with a pressure of up to 50–100 mm Hg.