Final answer:
The gallbladder secretes bile to the duodenum to break down proteins, while the liver produces bile to emulsify lipids. The pancreas produces enzymes that help break down carbohydrates, proteins, lipids, and nucleic acids.
Step-by-step explanation:
The gallbladder secretes bile to the duodenum, which uses it to break down proteins. The gallbladder is considered an accessory organ because food does not directly pass through it. The liver produces bile salts, which emulsify lipids, aiding their digestion and absorption. The pancreas produces pancreatic juice that contains enzymes such as amylase, trypsin, chymotrypsin, lipase, and ribonucleases and deoxyribonucleases. These enzymes help break down macromolecules like carbohydrates, proteins, lipids, and nucleic acids.