MICROANATOMY

Detailed explanation-1: -Each kidney has more functional capacity than is ordinary needed. Urine is move down the ureters by means of gravity. Urinary continence is frequently observed in the elderly. Hormones play an important role in regulating the function of the urinary system.

Detailed explanation-2: -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. About every 10 to 15 seconds, small amounts of urine are emptied into the bladder from the ureters.

Detailed explanation-3: -Each ureter arises at the renal pelvis of a kidney and travels down through the abdomen to the urinary bladder. The walls of the ureter contain smooth muscle that can contract to push urine through the ureter by peristalsis .