ANATOMY

Detailed explanation-1: -The sphincter is a muscle around the opening of the bladder. It squeezes to prevent urine from leaking into the urethra. This is the tube that urine passes through from your bladder to the outside. The bladder wall muscle relaxes so the bladder can expand and hold urine.

Detailed explanation-2: -The primary function of the detrusor muscle is to contract during urination to push the urine out of the bladder and into the urethra. The detrusor muscle will relax to allow the storage of urine in the urinary bladder.

Detailed explanation-3: -Controlling the outflow of urine are two valves, or sphincters, located in the bladder neck and earliest portion of the urethra. The bladder neck sphincter is under involuntary (autonomic) control while the urethral sphincter has both voluntary and involuntary components.

Detailed explanation-4: -The sphincter muscles are closed around the urethra. The urethra is the tube that carries urine out of the body. When the sphincter muscles keep the urethra closed, urine doesn’t leak.