Final answer:
The liver, gallbladder, and pancreas are accessory organs of the digestive system and are crucial for the chemical breakdown of food through the secretion of enzymes and bile.
Step-by-step explanation:
The liver, gallbladder, and pancreas are considered accessory organs of the digestive system. Their roles are essential to digestion, although food does not pass directly through these organs. They aid in the chemical breakdown of food by secreting enzymes and other substances necessary for digestion. The liver is the largest gland in the body and is responsible for producing bile, which helps in digesting fats. Bile is stored and concentrated in the gallbladder and released into the small intestine as needed. The pancreas produces digestive enzymes and buffers to aid in the breakdown of carbohydrates, proteins, and fats.