We tend to forget that the liver is a part of the organs that respond first against viruses and bacteria. Our livers are filled with cells that help in defending our immune system;
There are certain times where the liver aids other organs such as the brain when a person's blood sugar level drops. Since the brain relies on sugar as a source of energy, the liver reserve then releases the nutrients needed.
Alcohol cannot be directly excreted thus needing to be transformed in order to be eliminated;
The processing of alcohol involves the production of acetaldehyde which is a foreign, toxic molecule so it is quickly transformed into a non-toxic molecule;
The consumption of alcohol faster on a regular basis than what the liver can process may cause it to become inflamed which can lead to cirrhosis and permanently scar the liver.