Rings of muscle in the digestive tract that can open and close,regulating the movement of food into or out of parts of the digestive system,are

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Sphincters are the rings of muscle in the digestive tract that can open and close to regulate the movement of food into or out of parts of the system. Rumens are pouches in the digestive system of ruminant animals, chymes are partially digested food mixed with digestive juices, villi are small finger-like projections in the small intestine that absorb nutrients, and uvulas are fleshy tissue at the back of the palate that helps with speech and swallowing.

Rings of Muscle in the Digestive Tract That Can Open