List all of the sphincters in the gastrointestinal tract and indicate the location of each.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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List all of the sphincters in the gastrointestinal tract and indicate the location of each.

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A sphincter is a circular muscle that usually keeps a natural body passage or orifice constricted and relaxes when required for normal physiological function. Sphincters can be seen in a wide variety of species. There are over 60 different types of sphincters in the human body, some of which are microscopic in size, such as the millions of precapillary sphincters. When sphincters relax, fluids and feces are frequently released.

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