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Joe is eating pizza. By chewing, he is physically breaking down food with his teeth, known as mechanical digestion. Enzymes in his mouth are also breaking the food down, known as chemical digestion
After the pizza is able to be swallowed, the tongue pushes it into the back of the throat. Next, it travels down a long tube called to esophagus, which uses muscles to push the pizza into the stomach.
Once in the stomach, more digestion occurs using enzymes. The stomach can also store large amounts of food until it is digested.
After leaving the stomach, the pizza becomes a liquid-like substance called chyme, which enters the small intestine, a long, twisting tube lined with small structures called villi. Villi take nutrients from the chyme.
Next, it enters the large intestine, another long, twisting tube. It takes water out of what is left of the food so that the body doesn't become dehydrated. Feces is formed, and exits the body to get rid of waste.
The digestive system is important to obtain the nutrients we need. Without it, we would not be able to survive.
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