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Homocysteine is an amino acid. Amino acids are the building blocks of proteins. When proteins break down, elevated levels of amino acids like homocysteine may be found in the bloodstream. Having elevated levels of homocysteine in the blood (hyperhomocysteinemia) is associated with atherosclerosis and blood clots. It is not possible to get homocysteine from the diet. It must be made from methionine, another amino acid that is found in meat, fish, and dairy products.
1 a plug of platelets enmeshed in a. 2  network of insoluble fibrin molecules. 3  calcium ions (Ca 2+)(which is why blood banks use a chelating agent to bind the calcium in donated blood so the blood will not clot in the bag). 4  about a dozen other protein clotting factors.hen blood vessels are cut or damaged, the loss of blood from the system must be stopped before shock and possible death occur. This is accomplished by solidification of the blood, a process called coagulation or clotting. 1  a plug of platelets enmeshed in a. 2  network of insoluble fibrin molecules.