pacemaker - This keeps our hearts beating regularly., stent - A wire mesh placed inside an artery to open up a blockage., white blood cell - A component of blood that helps to fight off infection, transplant - Removal of an organ and replacing it with another one., Oxygen - The gas carried by red blood cells., valves - These stop blood flowing backwards in the heart and veins., arteries - These blood vessels have thick elastic walls., statins - These are pills that can help reduce blood cholesterol., right atrium - The place in the heart where our natural pacemaker can be found., left ventricle - This chamber of the heart has the thickest walls., Capillary - A microscopic blood vessel., Platelets - Help to form blood clots., Plasma - The liquid part of blood that carries substances such as glucose, carbon dioxide and urea., Haemoglobin - The red pigment found in a red blood cell that combines with oxygen., Vena cava - The main vein that brings deoxygenated blood back to the heart., Aorta - The main artery that takes blood from the heart around the rest of the body.,

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