the heart

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  • heart
    • the heart is a pumping organ that keeps the blood flowing around the body.
    • the heart has valves to make sure the blood flows in the right direction
      • they prevent it from flowing backwards
    • the heart has 4 chambers
      • the right atrium
      • the left atrium
        • blood flows through the atrium from the vena cava and the pulmonary vain
          • the right atrium
          • the atria contracts, pushing the blood into the ventricles
            • the ventricles contract, forcing the blood into the pulmonary artery and the aorta and out of the heart.
      • the right ventricle
        • the ventricles contract, forcing the blood into the pulmonary artery and the aorta and out of the heart.
        • the left ventricle
        • the left ventricle
        • resting heart rate
          • the resting heart rate is controlled by a group of cells in the right atrium wall that acts as a pacemaker.
          • these cells produce a small electric impulse which spreads to the surrounding muscle cells, causing them to contract
          • an artificial pacemaker is often used to control the heartbeat if the natural pacemaker cells don't work properly.
            • it is a little device that's implanted under the skin and has a wire going to the heart. it produces an electric current to keep the heart beating regularly.
        • the circulatory system
          • the right ventricle pumps deoxygenated blood to the lungs to take in oxygen
          • the left ventricle pumps oxygenated blood around all the other organs in the body. the blood gives up it's oxygen at the cells and the deoxygenated blood returns to the heart to be pumped out to the lungs again

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