For instance, any time you take aspirin, acetaminophen, or cold medicine, the liver changes these medicines, thereby helping them work in your body. Without your liver, these medicines won't work properly. So how well your liver is working will affect how much and how often you need to take a particular medicine. Your liver is a warehouse for the body. It stores sugars and some vitamins so your body can call for them when they're needed.
Most organs get their supply of blood directly from the heart.
However, because the liver has such an important role in preparing nutrition for the body, it gets its blood supply from both the heart and the digestive tract directly through a large blood vessel called the portal vein. This blood flows to millions of liver cells, called hepatocytes, which are organized into units called lobules. Each of these lobules is dedicated to carrying out the important body functions we've just discussed. Such substances or infections scar or even kill hepatocytes, and can lead to a condition called cirrhosis. The hepatitis B and C viruses can also sometimes cause cancer, probably because they change the cell's DNA, which is the part of the cell that tells it what to do.