Which cell type is primarily responsible for the liver's metabolic and synthetic functions?

• A. Hepatocytes (Parenchymal cells)
• B. Kupffer cells (RES)
• C. Fibroblasts
• D. Endothelial cells

Answer: (A)

The liver’s metabolic and synthetic activities are carried out primarily by hepatocytes, the highly specialized parenchymal cells that make up most of the liver tissue. These cells carry out the bulk of key functions such as glucose and lipid metabolism, synthesis of plasma proteins like albumin and clotting factors, bile production, and detoxification of drugs and toxins through various enzyme systems. Their arrangement in plates with blood flowing through sinusoids enables efficient exchange of nutrients, metabolites, and synthetic products with the bloodstream and bile.

Other cell types have important roles but not the primary metabolic and synthetic tasks. Kupffer cells are resident macrophages that handle immune defense and phagocytosis. Endothelial cells line the sinusoids and help regulate exchange between blood and liver tissue. Fibroblasts contribute to the extracellular matrix and structural support, and can participate in fibrotic processes, but they are not the main drivers of liver metabolism and synthesis.

So, the cell type responsible for the liver’s metabolic and synthetic functions is the hepatocyte.