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 …

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 …

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, …

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

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 …

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.

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

Dec 25, 2023 · Sphincters are circular muscles that constrict or relax to control the passage of materials. They’re found in various locations throughout the body, including the digestive, …

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 …

Four main sphincter muscles along the alimentary canal aid in digestion: the cardiac sphincter, the pyloric sphincter, and two anal sphincters. Other sphincters are found in the iris of the eye, the …