The Mouth
Chewing breaks down the food in your mouth, otherwise known as mechanical digestion. As you chew, the surface area of your food increases, making it easier for enzyme amylase in your saliva to break down the food even more into maltose, so it is small enough to pass into the oesophagus. Your food then passes through your oesophagus and into the gut. The food is moved through the gut by the peristalsis. The circular muscles contract as the longitudinal muscles relax, and this narrows the gut behind the food, pushing it forwards. In front of the food, the circular muscles relax and the longitudinal muscles contract, which widens the gut.
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