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In the mouth, the muscle help the teeth in cutting and breaking the food particles.

In the gastrointestinal tract, smooth muscles are present in the walls of the gastrointestinal tract ,and they help in the peristalsis which are the muscle contractions that produce the bowel movements which help in the movement of food (chyme) comming out of stomach into the intestines and through the intestines.

Also, muscles help closing and opening the sphincters present throughout the gastrointestinal tract.

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