The human organ capable of regenerating tissue is the liver. The liver is unique because it can regenerate lost tissue and restore its mass after injury or partial removal. This impressive ability allows it to maintain its vital functions, including detoxification, metabolism, storage of nutrients, and production of bile. Even if up to 75% of the liver is removed, it can grow back to its original size within a few months, given a healthy environment. However, chronic diseases such as cirrhosis can impair this regenerative capacity. The liver's regenerative capabilities make it a subject of interest in medical research and transplant studies.