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  • heart
    • the heart is an organ that pumps blood around the body in a double circulatory system
    • right ventricle
      • pumps blood to the lungs where gas exchange takes place
    • left ventricle
      • pumps blood around the rest of the body
    • pace maker (in the right atrium)
      • controls the natural resting heart rate
      • artificial electrical pace makers can be fitted to correct irregularities
    • coronary arteries
      • carry oxygenated blood to the cardiac muscle
    • heart valves
      • prevent blood in the heart flowing in the wrong direction


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