Nothing. The anus is the opening of the digestive tract. The opening is closed by the sphincter which is a strong ring of muscle.
The cervix, or cervix uteri, is the ring of muscle found at the base of the uterus.
The Ciliary Muscle is a circular ring of smooth muscle attached to the lens of the suspensory ligaments.
It's from a Latin word meaning "ring" because it's a ring of muscle.
No it is not.
It is the diaphragm.
the tunica media consists almost entirely of smooth muscle why?
Horses are unable to vomit (be sick); they have a strong ring of muscle at the top of their stomach that acts like a one way valve and does not allow food back up.
no
He's pretty strong he was probaly the strongest person in the ring.
The Iris.
The diaphram