The external anal sphincter plays a crucial role in helping us control defecation.

The pupillary sphincter adjusts the size of the pupil according to the intensity of light.

The vesical sphincter plays a crucial role in controlling the excretion of urine.

Dysfunction of the sphincter of Oddi is considered a type of gallstone disease.

The urethral sphincter is a muscle that controls the flow of urine.

The internal urethral sphincter plays a crucial role in controlling the flow of urine.

The anal sphincter is an important part of the body.

The Jin era was a particularly important period in Chinese history.

My grandmother always wraps a cloth around her head.

Smoking is prohibited in this park.