Erythrocyte - A type of cell found in the blood which has a biconcave shape and contains no nucleus., Leucocyte - A form of white blood cell. , Platelets - A small fragment of a cell which is involved in the process of blood clotting., Lymphocyte - Part of the specific immune system, it engulfs pathogens by phagocytosis., Prothrombin - The inactive form of thrombin. , Atherosclerosis - A potentially serious condition where arteries become clogged with fatty substances called plaques, or atheroma., Thrombosis  - When blood clots block veins or arteries., Angina - Chest pain caused by reduced blood flow to the heart muscles., Fibrin - Thread like structures produced by platelets to trap blood cells during the clotting process. , Atheroma - Deposits that form in the walls of an artery. They tend to be made up of cholesterol, fibres and dead muscle cells. ,

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