The ureters are narrow, hollow, muscular tubes, approximately nine inches long, that connect the kidneys to the bladder. Each kidney has its own ureter through which urine passes.
Urine does not flow in a slow, steady stream along the length of the ureters into the bladder. The walls of the ureters are composed of smooth, involuntary muscles that contract at the rate of anywhere between one to five times per minute and, by means of regular, peristaltic waves and gravity, push urine in spurts of about 1.5 teaspoons toward the bladder for storage and for later elimination.
You are totally unaware when your ureters are working because they are completely out of your control and are set in motion by electrical impulses inside your brain.
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