Liver Location, Functions, and Key Facts: A Comprehensive Overview

The liver is the body’s largest internal organ, weighing approximately 3 to 4 pounds (1.4–1.8 kg) in adults. It sits in the upper right quadrant of the abdomen, just beneath the diaphragm and protected by the lower ribs.

Primary Functions

The liver performs over 500 vital tasks. Key roles include:

• Blood Filtration: All blood leaving the stomach and intestines passes through the liver, where it removes toxins, bacteria, and waste products.
• Glucose Regulation: The liver stores glucose as glycogen and releases it into the bloodstream to maintain stable blood sugar levels between meals and during exercise.
• Bile Production: Hepatocytes produce bile, which is stored in the gallbladder and released into the small intestine to emulsify and digest dietary fats.
• Red Blood Cell Recycling: Old or damaged red blood cells are broken down in the liver; iron is salvaged and bilirubin is excreted in bile.
• Detoxification: The liver metabolizes drugs, alcohol, and environmental toxins, converting them into water-soluble compounds for excretion.
• Protein Synthesis: It manufactures essential plasma proteins such as albumin (maintains osmotic pressure), clotting factors (fibrinogen, prothrombin), and carrier proteins.

Additional Roles

• Cholesterol synthesis and regulation
• Storage of vitamins (A, D, E, K, B12) and minerals (iron, copper)
• Hormone metabolism (e.g., insulin, estrogen, cortisol)
• Immune function via Kupffer cells that phagocytose pathogens

Because of its central metabolic role, liver health is critical for overall well-being. Conditions like hepatitis, fatty liver disease, cirrhosis, and liver cancer can severely impair these functions.