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The muscle that controls the diameter of an opening is called a sphincter muscle. Sphincter muscles are circular bands of smooth muscle that encircle openings in various parts of the body, such as the digestive system and urinary tract. They contract to close the opening and relax to allow passage, thus regulating the flow of substances through these openings. Examples include the anal sphincter and the pyloric sphincter in the stomach.

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21h ago

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