The heart

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  • The heart
    • blood flows into top two chambers called atria.
      • blood entering left atrium is from pulmonary vein
        • oxygenated blood from the lungs
          • blood goes through the aorta artery to the rest of the body
            • atria contract and force the blood to the ventricles
              • contract and force blood out of the heart
              • valves close to stop the back flow of blood and make sure it is flowing in the right direction
            • aorta carries oxygenated blood away from the heart around the body
      • blood entering right atrium is from the vena cava
        • deoxygenated blood from the body
          • forced through pulmonary artery to the lungs
        • brings deoxygenated blood from the body the heart
    • problems with blood flow through heart.
      • coronary heart disease
        • coronary arteries become narrow
          • where the heart gets oxygenated blood from
        • caused by build up of fatty materials on the lining of vessels.
  • organ with four chambers
    • walls are made of muscular tissues.
      • wall is ticker on the left side o the heart as it has to pump more blood all around the body
    • The heart
      • blood flows into top two chambers called atria.
        • blood entering left atrium is from pulmonary vein
          • oxygenated blood from the lungs
            • blood goes through the aorta artery to the rest of the body
              • atria contract and force the blood to the ventricles
                • contract and force blood out of the heart
                • valves close to stop the back flow of blood and make sure it is flowing in the right direction
              • aorta carries oxygenated blood away from the heart around the body
        • blood entering right atrium is from the vena cava
          • deoxygenated blood from the body
            • forced through pulmonary artery to the lungs
          • brings deoxygenated blood from the body the heart
      • problems with blood flow through heart.
        • coronary heart disease
          • coronary arteries become narrow
            • where the heart gets oxygenated blood from
          • caused by build up of fatty materials on the lining of vessels.
  • helping the heart
    • your resting heart rate is controlled by a group of cells in the right atrium wall.
      • these cells act as a pacemaker - tell the heart when to pump blood
        • pacemaker that doesn't work properly causes an irregular heartbeat.
          • artificial pacemaker can be used to keep the heart beating regularly

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