A triglyceride is a fat. Triglycerides are found in foods and enter the bloodstream by way of the intestinal absorption. Triglycerides in the bloodstream may be deposited in either adipose or muscle tissue as body fat. High blood triglyceride readings indicate a diet is too high in fat. Blood triglyceride readings may be lowered by decreasing the percentage of total fat in the diet and by exercising.
Ferritin is the substance that recycles iron within the body.
Iron, which is found in the red blood cell, binds to and transports oxygen within the body. If adequate quantities of ferritin are present, the iron molecule can be salvaged from the old red blood cell and incorporated into a new one. A low ferritin level is the first sign of anemia. CPK is an enzyme found in muscle and the heart. During exercise, microscopic tears in the muscle allow CPK to leak into the bloodstream.