What is a primary function of the liver relevant to digestion and metabolism?

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The liver’s role in digestion and metabolism centers on bile production and nutrient processing. Bile emulsifies fats, making them easier to digest in the small intestine, which directly supports fat digestion. At the same time, the liver metabolizes nutrients—storing and releasing glucose as glycogen to regulate blood sugar, processing lipids and proteins, and synthesizing key proteins needed for metabolism and transport. This combination of bile production for fat digestion and extensive nutrient metabolism is the primary way the liver supports both digestion and overall metabolic regulation. Functions like gas exchange occur in the lungs, and hormone synthesis is mainly the domain of endocrine glands; while the liver does detoxification and protein production, those are not as central to digestion and metabolism as bile production and nutrient processing.