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Sphincter muscles are muscles that have passages and openings of the body.
The sphincter muscle expands and contracts in response to a stimuli.

Some of the examples of sphincters muscle are eyes, cardia, and anus.
Iris- changes size based on light
Cardia- allows food to pass
Anus- releases waste

Sphincter muscles.

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Muscular System

By Kamren Sargent