artery - A tube that carries blood away from the heart. Most arteries carry oxygenated blood to body cells. Arteries also carry de-oxygenated blood to the lungs., blood - The fluid pumped by the heart around the circulatory system. Blood carries oxygen and nutrients to cells, and removes wastes. , blood plasma - A blood component made of water with dissolved nutrients and wastes, blood vessel - Any tube that blood flows through. Blood vessels come in three main types: arteries, veins and capillaries., capillary - A tiny blood vessel where substances pass to and from the blood, circulation - The movement of blood around the body. Blood flows through a network of blood vessels, and is pumped by the regular beating of the heart. , de-oxygenated - Having low levels of oxygen. The heart pumps de-oxygenated blood to the lungs to collect more oxygen., haemoglobin - A protein in red blood cells that transports oxygen. Blood gets its bright red colour when haemoglobin picks up oxygen in the lungs. , heart - A muscular organ that pumps blood around the body. The heart is the central organ in the circulatory system. The human heart is divided into four chambers., left atrium - A heart chamber that receives blood from the lungs. A major vein carries oxygenated blood from the lungs to the left atrium of the heart. , left ventricle  - A heart chamber with thick walls that pumps blood to the body. The left ventricle pumps oxygenated blood through arteries to body cells. , oxygenated - Having high levels of oxygen. The heart gets oxygenated blood from the lungs and pumps it to body cells, where it becomes de-oxygenated., platelet - A blood component that helps form clots to stop bleeding, red blood cell - A blood component that transports oxygen. Red blood cells are specialized to carry oxygen, which attaches to the protein haemoglobin., right atrium - A heart chamber that receives blood from the body. Veins carry de-oxygenated blood from body cells to the right atrium of the heart. , right ventricle - A heart chamber with thick walls that pumps blood to the lungs. The right ventricle pumps de-oxygenated blood through arteries to the lungs., valve - A structure that only allows flow in one direction, vein - A tube that carries blood back to the heart. Most veins carry de-oxygenated blood from body cells back to the heart. Veins also carry oxygenated blood from the lungs., white blood cell - A blood component that helps protect the body from infection,

Circulatory system

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