Abstract
As the circulatory system evolved in higher organisms, one of the problems that had to be overcome was the transport of fats and other apolar substances having low affinity for water. At least in mammals, binding to albumin became the vehicle for carrying out the exceedingly rapid movement of unesterified fatty acids that exist in extracellular fluid as anions (FFA). Different proteins were selected to transport the esterified fatty acids and sterols that make up the bulk of lipids in plasma, as well as acyclic alcohols and traces of hydrocarbons. These proteins combined with the lipids to form macromolecular complexes which today we call lipoproteins.
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