Weighing in at around 3 pounds, the liver is the body’s second largest organ; only the skin is larger and heavier. The liver performs many essential functions related to digestion, metabolism, immunity, and the storage of nutrients within the body. These functions make the liver a vital organ without which the tissues of the body would quickly die from lack of energy and nutrients. Fortunately, the liver has an incredible capacity for regeneration of dead or damaged tissues; it is capable of growing as quickly as a cancerous tumor to restore its normal size and function.

The liver is a roughly triangular organ that extends across the entire abdominal cavity just inferior to the diaphragm. Most of the liver’s mass is located on the right side of the body where it descends inferiorly toward the right kidney. The liver is made of very soft, pinkish-brown tissues encapsulated by a connective tissue capsule. This capsule is further covered and reinforced by the peritoneum of the abdominal cavity, which protects the liver and holds it in place within the abdomen.

The liver consists of 4 distinct lobes – the left, right, caudate, and quadrate lobes.

Bile Ducts
The tubes that carry bile through the liver and gallbladder are known as bile ducts and form a branched structure known as the biliary tree. Bile produced by liver cells drains into microscopic canals known as bile canaliculi. The countless bile canaliculi join together into many larger bile ducts found throughout the liver.

These bile ducts next join to form the larger left and right hepatic ducts, which carry bile from the left and right lobes of the liver. Those two hepatic ducts join to form the common hepatic duct that drains all bile away from the liver. The common hepatic duct finally joins with the cystic duct from the gallbladder to form the common bile duct, carrying bile to the duodenum of the small intestine.  Most of the bile produced by the liver is pushed back up the cystic duct by peristalsis to arrive in the gallbladder for storage, until it is needed for digestion.

The physiology of the liver:

The liver regulates most chemical levels in the blood and excretes a product called bile. Bile helps to break down fats, preparing them for further digestion and absorption. All of the blood leaving the stomach and intestines passes through the liver. The liver processes this blood and breaks down, balances, and creates nutrients for the body to use. It also metabolized drugs in the blood into forms that are easier for the body to use.  Many vital functions have been identified with the liver. Some of the more well-known functions include the following:

• Production of bile, which helps carry away waste and break down fats in the small intestine during digestion
• Production of certain proteins for blood plasma
• Production of cholesterol and special proteins to help carry fats through the body
• Store and release glucose as needed
• Processing of hemoglobin for use of its iron content (the liver stores iron)
• Conversion of harmful ammonia to urea (urea is one of the end products of protein metabolism that is excreted in the urine)
• Clearing the blood of drugs and other harmful substances
• Regulating blood clotting
• Resisting infections by producing immune factors and removing bacteria from the bloodstream
• Clearance of bilirubin (if there is a buildup of bilirubin, the skin and eyes turn yellow)
• When the liver has broken down harmful substances, they are excreted into the bile or blood. Bile by-products enter the intestine and ultimately leave the body in the feces. Blood by-products are filtered out by the kidneys and leave the body in the form of urine.

Introduction to LIVER DISEASE:

Liver Disease is also referred to Hepatic Disease. Liver Disease is a term that is used when there is any disturbance of the liver function that causes illness. It is a broad term to describe when more than 75% or three quarters of liver tissue needed is affected and decreased function in the liver occurs. The number one cause of liver disease is alcohol abuse in North America. They can cause liver inflammation, referred to as alcoholic hepatitis. Other causes include Cirrhosis, Cholestasis, Steatosis, Hepatitis, Viruses, Non-Alcoholic Fatty Liver, Hemachromatosis, Wilson’s Disease and Gilbert’s Disease.

Stayed tune for Part 2 on specific diseases