The human digestive system is a long tract that is made up of several organs each playing a specific role. When we eat food, food goes through the process of digestion where large particles are broken down into small particles that can be easily absorbed by the body. It all begins when a piece of food gets into the mouth and we start chewing with our teeth. This process breaks down large food particles into smaller particles. In the mouth, an enzyme called salivary amylase starts to act on the food. From the mouth, muscle movements push the food to the back of the throat and into the esophagus where further movements send the food into the stomach. The stomach is a j-shaped sag that is lined with muscles. In the stomach, food is churned through bowel movements to mix it up to smaller particles. The stomach is also very acidic and all the food in the stomach gets mixed in this acid medium and further broken down. Food moves from here into the small intestine where bile and other enzymes further break it down. Nutrients derived from food are also absorbed here. The rest, mostly waste, transitions into the large intestine where there is further absorption of fluids. Food waste is evacuated through the anus as feces.
This page features an interactive quiz on the major organs of the digestive system. This online worksheet on the digestive system can be used to learn by children in 2nd, 3rd, 4th, 5th, 6th, and 7th grade.