The Heart: Our Circulatory System

By: Seymour Simon

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Synopsis: You know your heart beats, but did you know it beats over two billion times in a lifetime? You know you have veins, but did you know that the upper vena cava is as wide as a pencil and brings blood from your brain and upper body back to your heart? You know blood flows, but did you know your veins have valves like parachutes that open and close to keep blood from flowing backwards? You know you have red blood cells, but did you know that if they were stacked on top of each other they'd make a column thirty thousand miles high? Blood flows through arteries and veins. Do you know the difference between them? Discover what jobs the white and red blood cells do to keep you alive. Learn the parts of your heart and the blood vessels that let your blood flow to every part of your body. You'll learn new, big words like: septum, hemoglobin, atria, valve, ventricles, plasma, cells, pulmonary, veins, arteries, marrow, venules, alveoli, neutrophils, capillaries, sinoatrial node, and upper and lower vena cava. Find how a muscle the size of a large sweet potato keeps you alive. You'll be interested and learning as you read and you'll become smart about your heart. Read other books by this author from Bookshare including The Brain, Mars, Muscles and Bones.