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Blood cells are the cells that circulate through the blood and play a vital role in maintaining our health. There are three main types of blood cells: red blood cells, white blood cells, and platelets. Red blood cells carry oxygen from the lungs to the rest of the body and help remove carbon dioxide from the tissues. White blood cells help fight infection and protect us from disease. Platelets are essential for clotting and stopping bleeding. Each type of blood cell has a specific function, but they all work together to keep us healthy.