Anatomical sphincter

Definition

An anatomical sphincter is a circular muscle that constricts or dilates to regulate the passage of substances through a bodily opening. In the context of the urinary system, it controls the release of urine from the bladder.

Related terms

Urethra: The tube that carries urine from the bladder to the outside of the body.

Urinary Bladder:

A hollow organ in which urine is stored before it is expelled from the body.

Micturition:

The process of expelling urine from the bladder; also known as urination