Bile.

Bile is a yellow or green fluid that is secreted by hepatocytes or liver cells. Bile is composed of several materials, including water, cholesterol, pigments (bilirubin, produced by the breakdown of red blood cells), acid, lecithin, and bicarbonate. Bile is produced in the liver, but it is stored in the gallbladder, a small saclike organ that is tucked into the liver. The human liver is able to produce almost one liter of bile a day.