Your ability to feel and respond to the urge to urinate.The nerves controlling your urinary system.Your bladder muscles and other parts of your urinary tract.As this happens, the sphincter muscle relaxes to allow the urine to pass through.Īll of these systems must work together to control urination: When you urinate, the bladder wall muscle squeezes to force urine out of the bladder. The bladder wall muscle relaxes so the bladder can expand and hold urine.This is the tube that urine passes through from your bladder to the outside. It squeezes to prevent urine from leaking into the urethra. The sphincter is a muscle around the opening of the bladder.Two muscles help prevent the flow of urine: Most people can hold more than 2 cups (480 milliliters) of urine in the bladder. You should feel the first urge to urinate when there is a bit less than 1 cup (240 milliliters) of urine in your bladder. As your bladder fills with urine from the kidneys, it stretches to make room for the urine.
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