Sep 3, 2025 · Sphincters are circular-shaped muscles that open and close to control the flow of food, air, bile, pee and poop through your body. When a sphincter is relaxed, a substance can easily flow …

Dec 8, 2025 · Sphincters are muscles that control the flow of substances in the body. There are over 60 types of sphincters found throughout the digestive tract, urinary tract, blood vessels, and eyes. The …

A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and relaxes as required by normal physiological functioning. Sphincters are found in many animals.

sphincter muscle, any of the ringlike muscles surrounding and able to contract or close a bodily passage or opening.

Oct 10, 2024 · The internal anal sphincter is involuntary, while the external anal sphincter is under voluntary control. Together, they maintain continence and allow for controlled defecation.

Jan 6, 2026 · A sphincter is a ring-shaped muscle that surrounds and guards a natural passage or opening within the body. These muscular structures function as biological valves, regulating the flow …

Sphincters are located at various critical junctures within the digestive system, controlling the entry and exit of food material as it moves through different stages of digestion. These specialized muscles …

The meaning of SPHINCTER is an annular muscle surrounding and able to contract or close a bodily opening.

May 10, 2025 · A sphincter is a ring-like or circular muscle that maintains constriction of a body passage or orifice and relaxes as required by normal physiological functioning.

Oct 11, 2025 · A sphincter is a circular or ring-like muscle that acts as a valve to control the flow of substances through a bodily passage. By contracting, a sphincter can close an opening or passage, …