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Sphincter
The sphincter forms a circle around the above-mentioned structures in such a way that when the muscle tightens and becomes narrower, the opening or space inside of the tubes becomes narrower as well, which can eventually cause them to close. There are at least 42 different sphincters in the human body, some of which are visible to the naked eye and some of which can only be seen with a microscope. Most sphincters are part of the digestive system. Sphincter is also known as the sphincter muscle or musculus sphincter. Sphincter comes from the Greek word "sphingein" meaning "to bind."
A muscle that forms a circle around a tube, natural opening, or duct in the body. A duct is a tube that allows fluids and/or substances to pass through it, especially those produced by organs in the body known as glands. A gland is an organ in the body made of special cells that form and release materials such as fluid. A cell is the smallest, most basic unit of life, that is capable of existing by itself.
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