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Bitmap Image  |  1995-06-29  |  84.5 KB  |  510x394  |  8-bit (124 colors)  |  [TEXT/LMAN]
   ocr: HEART AND CIRCULATION NI ANIMAL'S circulatory system Arcries blood around its body through a network of vessels. Arteries Lung are thick vessels carrying blood pumped under pressure from the heart. Blood returns to the heart Deoxygenated Oxygen- in veins, which have thin walls. blood to lungs rich blood Arteries are too big to reach every to heart cell. They branch out into tiny tubes called capillaries. These have such thin walls that substances can easily Left pass to and from the blood and the side cells. Capillaries join together to Vein form veins. Heart Circulation The. buman beart is a ...