One is the Liver, which cleans the blood and food of bacteria and viruses. This is the organ that cleans all the food to be sent through the Duodenum to the Small Intestine. The Liver is very important because it cleans the blood to be sent through the whole body and sends the oxygen to all the blood streams.
The Pansreas is the organ that secretes insulin into the blood to keep normal blood sugars. If your Pancreas stops making insulin or starts to make to much you can get diabetes. So then you have to give yourself shots of insulin.
The Small Intestine is the organ that completes digestion. Once the bolus (ball of digested food) reaches the small intestine all the small intestine obsorbes all the water from it. It then sends it to the large intestine to be gotten rid of.
The Large Intestine is the organ the does do ant dugestion. It is the one that creates feces to get rid of the waste. Once it has created the waste it will fill up and when done you will have to go to the bathroom.