What is the physiological mechanism of the liver?

The liver is a vital, multifunctional organ that serves as the body’s primary metabolic and detoxification center. Its physiological mechanisms encompass several critical processes: metabolism of carbohydrates, lipids, and proteins; synthesis of essential plasma proteins (e.g., albumin, clotting factors like fibrinogen and factors II, VII, IX, and X); bile production and secretion to facilitate fat digestion and absorption; storage of glycogen, vitamins (A, D, E, K, B12), and minerals (e.g., iron and copper); and biotransformation and elimination of endogenous waste products (e.g., bilirubin, ammonia) and exogenous substances (e.g., drugs, toxins). Hepatocytes—the predominant parenchymal cells—perform most of these functions, while specialized non-parenchymal cells, including Kupffer cells (liver-resident macrophages), hepatic stellate cells, and sinusoidal endothelial cells, contribute to immune surveillance, fibrogenesis regulation, and vascular homeostasis. The liver’s unique dual blood supply—via the nutrient-rich portal vein (≈75% of hepatic blood flow) and oxygen-rich hepatic artery—enables efficient processing of absorbed intestinal nutrients and systemic circulation metabolites. This integrated architecture supports the liver’s central role in maintaining metabolic homeostasis, systemic immunity, and overall physiological resilience.