Proper rings are only formed by smooth mucle and are called sphincters. NB not all sphoncters are proper ring.
sphincter
The Pyloric Sphincter is a ring of muscles that regulates the emptying of the stomach into the duodenum and prevents the contents of the small intestine from moving back into the stomach.
iris
Anus. The muscles of the anus are called sphincters, or in doctor terminology, sphincter complexes.
The ring finger is weaker compared to other fingers because it has fewer independent muscles and tendons supporting its movements. Additionally, the ring finger is biomechanically connected to the little finger, further limiting its strength and dexterity.
Its a ring of muscles that move an animals food through its stomach and intestines.
The anal canal has a ring of muscle, called the anal sphincter
The pinky and ring finger move together because they are controlled by the same muscles and tendons in the hand. These muscles work together to allow the fingers to move in sync when performing tasks like gripping objects or making certain hand gestures.
The ring shaped muscle in the digestive system is the lower esophageal sphincter (LES).
sphincters
Smaller than Jerry, Freddie/Muscles and Joey
because the muscles in each finger aren't strong enough to move individually.