<prompt> The four major bile acids found in humans are synthesized from:CholesterolAmino acidsBilirubinProtein  <response>: When considering bile as a digestive secretion, it is the bile acids that represent the most impoant components. They are synthesized from cholesterol and secreted into the bile conjugated to glycine or taurine, a derivative of cysteine. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. 2012. Chapter 25. Overview of Gastrointestinal Function Regulation. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks Eds, Ganongs Review of Medical Physiology, 24e. 