the final organ in the digestive system is the large in the large intestine.while no digestion occurs here,this is a very important step. as the remaining undigested food passes through,the large intestine reabsorbs available water back into the body. the capillaries in the intestinal wall.then the blood take the water and redistributes it to other cells.what is left is the remaining material from food that the body does not need.the large intestine then passes this remaining waste out of the body.