Labels:daily | hakham | reckoner OCR: INTERNAL SPHINCTER "HE INTERNAL SPHINCTER ring of muscle that surrounds the upper end of your urethra (the passageway from your bladder to the outside of your body) .It opens and closes without your voluntary control The sphincter keeps your urethra closed. until reflex signals from vour spinal cord, res sponding to a full bladder, allow relax. This opens the top part your urethra allowing urine released from your bladder INTERNAI passagew proo responding allowi
