The digestive system

When you eat your food, the teeth and saliva in the mouth would break down the starch , the tongue would help mix the food with the saliva. When it reaches the gullet, the muscles in its walls would contract and relax to produce a wave-like movement that pushes the food into the stomach. When it reaches the stomach, the muscles in the wall of the stomach contract and churn the food to mix it with digestive juices. After that it reaches the small intestine where most of the digestion occurs. The undigested food is then moved to the large intestine where the cells lining the large intestine absorb vitamins as well as mineral salts and excess water. The rest are discharged from the body through the anus.