Final answer:
Accessory organs including the liver, pancreas, and gallbladder secrete bile and digestive enzymes, critical for breaking down food into absorbable nutrients during the digestive process.
Step-by-step explanation:
The accessory organs of the digestive system aid in the breakdown of food through the secretion of various substances. These organs include the liver, pancreas, and gallbladder. The liver's role in digestion is to produce bile, which is then transferred to the duodenum. The gallbladder's function is mainly to store, concentrate, and release this bile. Lastly, the pancreas is responsible for creating pancreatic juice, rich in digestive enzymes and bicarbonate ions, and releasing it into the duodenum to continue the chemical digestion process. These substances are crucial for breaking down food into nutrients that the body can absorb.