Rapid Tone

Rapid Tone Simply put, its job is to prevent the contents of the stomach from flowing upwards or in the opposite direction. The image given below will give a better idea about the exact location of the cardiac sphincter in relation to the other parts of the digestive system. The sphincter is a ring of muscular tissue that contracts to close the passageway. It is a thick circular muscle wall that regulates the movement of food from the esophagus. The contraction of muscular ring seals off the esophagus. 

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