Digestive system is for the digestion of food. The digestive system consists of mouth, food-pipe, stomach, small intestine, large intestine and anus.
We eat food to get energy for doing work. Food undergoes many changes in passing from mouth to anus, through food-pipe and stomach. These changes are called the process of digestion.
Now we will see the changes that the food undergoes in the process of digestion. First we put the food in our mouth to eat. Digestion starts in the mouth itself, when we chew the food with our teeth and saliva from the salivary glands wets it. The chewed food goes into stomach through food-pipe. Various digestive juices mix into the food when it reaches the stomach. From stomach, the food goes to small intestine. Here different kinds of juices from liver and pancreas and intestine mix into it to complete the digestion. The digested food goes to all parts of the body through our blood to give us energy.
The undigested food goes into large intestine from where it is sent out through anus.