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The Digestive System Precy Acacio Parts of the Digestive System Food We need food to stay alive, healthy, and to grow. Food contains nutrientsproteins, sugars, fats, vitamins, minerals, and water-that give us energy and help us grow. Our bodies must break down food so we can use its nutrients. This process is digestion. Mouth Digestion starts in the mouth. We chew food to break it down. Saliva softens it. Our tongue then pushes food to the throat. Esophagus After swallowing, the chewed food travels down the food tube, or esophagus. Muscles in the esophagus squeeze the food down into the stomach. Stomach Muscles and powerful juices in the stomach further mash and break down the food and turn it into a paste similar to mashed potatoes. Small Intestine After mashing the food, the stomach then squeezes the paste into the coiled-up small intestine. More juices mix with the food until it is completely broken down. The parts of the food that the body can use are absorbed into the bloodstream. Large Intestine The unusable parts of the food move into the large intestine where we release them from the body as solid waste. Kidneys Liquid waste is filtered from the blood by the kidneys and is released from the body as urine. The End