Urine Storage

Ureters: muscular tubes that are about 25cm long and connect the kidney to the bladder

Layers 2 smooth muscle, 1 connective Urine enters the ureters causing it to stretch

which stimulates the surrounding smooth muscle to start a peristaltic wave to push urine to bladder

Bladder

Is muscular sac that holds urine The bladder has rugae or wrinkles that stretch

due to urine pressure Stretch receptors reach threshold and send a

message to the brain to cause urge to void

Urethra

A thin walled tube that starts with the internal urethral sphincter and is caped with the external urethral sphincter

Only the external urethral sphincter can be voluntarily controlled

Voiding The process of voiding urine is called

micturition This process is controlled by the sympathetic

nervous system The bladder is told to constrict by the CNS as

the interior and exterior urethral sphincters are told to relax