internal urethral sphincter
A sphincter
The internal urethral sphincter an involuntary sphincter that keeps the urethra closed when urine is not being used. The external urethral sphincter is fashioned by skeletal muscles as the urethra passes thorugh the pelvic floor.This sphincter is voluntary controlled.
It keeps the anus closed
The urethra sphincter is a muscle that keeps the urine in your bladder. It is not a condition, so it has no symptoms.
There is a spring on the fuel door hinge that keeps the fuel door closed. I hope this info helps.
closed off
It is much harder to walk into a closed door. It also keeps the contents of the cupboard in place, aand keeps foreign material out of the cupboard.
closed fracture and open fracture
closed fracture and open fracture
Breathing.
closed fracture and open fracture
Gravitation keeps the planets from being pulled into the Sun.
a closed coffee lid