Labels:book | bulletin board | colostrum | door | earth | sky | tribute album | windowpane OCR: HEART AND CIRCULATION ANIMAL'S circulatory system carries blood around its body through network of vessels Arteries Lung are thick vessels carrying blood pumped under pressure from the heart Blood returns to the heart xygen in veins, which have thin walls blood tr lung rich olood Arteries are too big to reach every 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 cells. Capillaries join together Vein form veins Circulation Heart The buman beart double Rest pump The right side pumps ofbody blood to the lungs and the lef side sends blood around the body. Oxygen toge ther buma punotv
(.png)
