Final answer:
The liver is the crucial organ vital to metabolism for digestion in the body, as it produces bile, which is necessary for the digestion of fats. The pancreas contributes by secreting vital digestive enzymes, while the gallbladder stores and concentrates bile for digestive processes.
Step-by-step explanation:
The liver is the proper organ that a client should reference when discussing the key organ vital to metabolism for digestion in the body, especially regarding the digestion of fats. The liver produces bile, which is a critical digestive juice necessary for the emulsification and breakdown of dietary lipids. The liver also has several other functions, including metabolizing vitamins and minerals, synthesizing proteins and lipids, and detoxifying blood.
On the other hand, the pancreas also plays an important role in metabolism by secreting digestive enzymes and buffers, including amylase for starch, lipase for lipids, and proteases like trypsin and chymotrypsin for proteins, that enter into the duodenum. The gallbladder stores and concentrates bile produced by the liver and releases it into the duodenum when needed for digesting fats.