Final answer:
LCAT is synthesized in the liver and acts in the plasma.
Step-by-step explanation:
The synthesis and site of action for LCAT in the human body is as follows:
LCAT, which stands for Lecithin Cholesterol Acyltransferase, is synthesized in the liver and acts in the plasma. The liver plays a major role in lipid metabolism, including the production of triglycerides and cholesterol synthesis. LCAT is involved in the metabolism of cholesterol and helps to convert free cholesterol into cholesteryl esters, which are transported through the bloodstream in the plasma.