Liver Anatomy, Function, Diseases, and Protection

Liver Anatomy

The liver is the largest internal organ in the body. It is in the upper right quadrant of the abdomen directly below the diaphragm. The liver has four lobes, 2 of which are visible in the diagram, and 2 smaller lobes behind the larger ones. It is also contained in a fibrous layer of connective tissue that surrounds the organ. This layer protects the liver.

As noted in the above diagram, it has a portal vein that carries 75% of the blood flow. It carries the deoxygenated, nutrient-rich blood directly from the gastrointestinal tract and spleen for processing and detoxification. The hepatic artery carries only 25% of the blood flow and supplies oxygenated blood from the celiac trunk to the liver.

If you took a section of the liver and looked at it through a microscope, you would see different cell types and microscopic anatomy. There are hepatic lobules structured in hexagonal shapes. In the center of each of these lobules, there is a place to collect and drain blood. These lobules are drained by a portal triad that's positioned at the corner of the lobules, and they each contain a branch of the hepatic artery, a branch of the portal vein, and a bile duct. The cell types in the liver are amazing at best. There are hepatocytes, which are the primary functional cells. They are responsible for metabolic, endocrine, and exocrine tasks. There are Kupffer cells, which are resident macrophages that engulf pathogens, debris, and worn-out cells. Microscopic channels called canaliculi collect bile produced by the hepatocytes and merge into larger hepatic ducts, eventually forming the common hepatic duct.

Liver Functions

The liver is a vital organ, and without it, the human body could not survive. It carries out over

500 vital metabolic processes, which can be grouped into four primary categories.

1. Metabolic regulation- carbohydrate metabolism, which regulates blood glucose levels. It

stores excess glucose as glycogen and breaks it down when glucose is needed for the

body's metabolism. It also metabolizes lipids and proteins.

2. Synthesis and plasma protein production- these Proteins include albumin and clotting

factors, and it also produces bile

3. Detoxification and filtration-the liver can metabolize and neutralize toxins, alcohol, and

drugs. It excretes bilirubin from the breakdown of red blood cells. It filters bacteria and

foreign particles from the blood through the KUPFFER cells

4. The liver acts as a storage reservoir for four vitamins: A, D, E, K, and B12

Liver Diseases

When the liver gets damaged, its ability to perform all the above functions gets compromised.

When these get compromised, the entire body suffers.

1. Hepatitis, or inflammation of the liver, can be caused in several ways. It can be caused by

viral hepatitis from specific viruses. It can be caused by autoimmune hepatitis and, lastly,

by alcohol hepatitis.

2. Fatty liver disease, the first of which used to be called steatohepatitis, is defined as fat

accumulation in the liver not caused by alcohol, heavily linked to insulin resistance,

obesity, and type 2 diabetes, and alcohol related liver disease, which is caused by cellular

stress resulting directly from chronic alcohol abuse.

3. Cirrhosis is an advanced, irreversible stage of progressive liver scarring called fibrosis.

Normal liver function is replaced by scarring that obstructs blood flow through the organ

and leads eventually to liver failure or portal hypertension.

4. There are two genetic and metabolic disorders that should be mentioned. The first is

hemochromatosis, which is a genetic disorder that causes the body to absorb too much iron,

leading to a toxic overload in the liver and other organs. The second is Wilson's disease,

which is a rare inherited disorder that prevents the body from eliminating excess copper;

this causes toxic levels in the liver and brain.

5. Liver Cancer: The most common form of primary liver cancer is called hepatocellular

carcinoma. It is heavily associated with underlying chronic liver diseases like cirrhosis and

chronic hepatitis B or C infections.

6. Acute liver failure is a rapid, life-threatening loss of hepatic function occurring within days

or weeks. Usually, this rapid onset is frequently triggered by drug toxicities such as an

acetaminophen overdose or sudden toxic exposure.

MOST EFFECTIVE WAYS TO PROTECT YOUR LIVER

1. Limit alcohol or avoid it entirely

2. Maintain a healthy weight because fatty liver disease is now extremely common.

Controlling your weight decreases liver fat and inflammation.

3. Eat a liver-friendly diet. A diet that is high in fiber, rich in Omega-3s, low in added sugars,

and avoiding saturated fats. Current research has found that the Mediterranean diet is one

of the best for liver health.

4. Be careful with all medications and supplements. Always check with your provider. Never

mix alcohol with medications.

5. Exercise regularly

Conclusion

The liver is an amazing organ vital to a healthy life. A complex anatomy and many functions make it difficult to fully grasp that one organ can do everything it does. If disease occurs, understanding how devastating it can be and how it disrupts a person’s life is important. This makes protecting your liver even more crucial. Avoiding bad habits, eating healthy, and exercising can help you live a healthier life.

References

1. Cleveland Clinic. (2025, September 26). Liver: Where it's located, function & anatomy.

Cleveland Clinic. https://my.clevelandclinic.org/health/body/21481-liver

[my.clevela...clinic.org]

2. MedlinePlus. (2024, December 5). Liver diseases. U.S. National Library of Medicine.

https://medlineplus.gov/liverdiseases.html [medlineplus.gov]

3. National Institute of Diabetes and Digestive and Kidney Diseases. (n.d.). Liver disease.

U.S. Department of Health and Human Services. http://www.niddk.nih.gov/health-

information/liver-disease [Liver Dise...se - NIDDK]

4. National Institute of Diabetes and Digestive and Kidney Diseases. (n.d.). Liver disease research

areas. U.S. Department of Health and Human Services. Liver Disease Research Areas

[niddk.nih.gov]

5. American Liver Foundation. (2020, May 20). 25 ways to love your liver health. American Liver Foundation. https://liverfoundation.org/resource-center/blog/25-ways-to-love-your-liver-

health/ [liverfoundation.org]

Assessed and Endorsed by the MedReport Medical Review Board