Heart

    • Heart disease is the top cause of American deaths Cardiovascular disease 101
    • Hearts can have two, three, or four chambers
    • In a lifetime, they beat up to 3.5 billion times Anatomy Of The Heart
    • Cardiovascular exercise is specifically designed to help strengthen the heart
    • The mass of a normal adult human's heart is 9-12 oz (250-350 grams) Anatomy Of The Heart
    • A common earthworm has 5 hearts

  • The heart is a centralized organ in vertebrates which is the primary mechanism of circulating blood. It is composed of a special type of muscle tissue, cardiac muscle, which is only found in the heart. Heart disease is the number one cause of death amongst Americans. Enlarged hearts can result from exercise or disease. A wide range of ailments can affect the heart, including Kawasaki Disease and Cardiomyopathy. Mammals and birds have four chambers, amphibian hearts have three, and fish hearts have only two.

  • Structure

    The human heart is separated into four chambers, two which operate to pump deoxygenated blood to the lungs (where they absorb oxygen), and two which operate to pump oxygenated blood to all the other tissues of the body. Deoxygenated blood enters the right atrium, moves to the right ventricle, and then is moved to the lungs. From the lungs, it passes to the left atrium, then moves to the left ventricle, then is pumped to the rest of the body. Once the body has absorbed the oxygen, the blood enters the heart and begins the cycle anew.

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