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Circulatory System (The chambers (A wall called the interventricular …

- - - - They are the thickest blood vessels
    - - The aorta curves up and back from the left ventricle
    - - They divide into smaller arteries that provide
        oxygen and nourishment to the muscles
    - - Carries poorly oxygenated blood
      - From the right ventricle, the pulmonary artery divides into
        right and left branches
      - On its way to the lungs it picks up oxygen
        into the blood
    - - Veins carry blood back to the heart
      - They are not as muscular as arteries
      - Veins contain valves that prevent the blood from flowing backwards
      - The two largest veins are the
        vena cavae
        
        They are located above and below
        the heart
    - - Capillaries connect the arteries and blood vessels
      - They are the most important part of the circulatory system
      - Through them the oxygen and nutrients are delivered to the cells
      - Waste products such as carbon dioxide is removed
        through the capillaries
    - - The gas exchange happens here