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

A urethral infection can be very painful.

A sphincter plays a role in opening and closing certain parts of the body.

Let's play outside.

There is no one else but me.

Do you remember where you put the remote control?

He is operating a radio-controlled helicopter.

The results of the urine test are out.

In this ancient document, the word 'urine' is used.

The doctor recommended a urine test to examine my urine.