The liver's function in producing bile is vital for digestion. Cells in the human body grow by building up amino acids from the blood into new proteins, needed for muscle, tendons, skin, hair, and haemoglobin. Excess amino acids are broken down in the liver to form urea which the kidneys then excrete in urine.
The liver secretes bile, a dark-green or yellowy-brown fluid. Bile is what the liver uses to digest fats.The bile ducts carry bile from the liver into the pancreas to the duodenum, which is a part of the small intestine. The small intenstine uses the bile to break down the fats further.