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  • Heart and Circulatory System
    • Picture of the Heart and Circulatory system
    • The heart is a four-chambered muscular pump which pumps blood round the circulatory system
      • The right side of the heart pumps de-oxygenated blood to the lungs to pick up oxygen
      • The left side of the hear pumps the oxygenated blood from the lungs around the rest of the body
    • 1. Deoxygenated blood enters through the vena cava in the right atrium
      • 2. It;s then pumped through a valve into the right ventricle chamber
        • 3. And then through the pulmonary valve into the pulmonary artery towards the lungs
          • 5. It's then pumped through a valve into the lft ventricle
            • 6. And then through the aortic valve and out the aorta to te rest of the body
    • More depth details
    • How blood is imported
      • Arteries (thick walled muscular tubes) carry blood away from the hear at high pressure in thick walled lumen
        • Then the capillaries (very narrow tubes) have thin walls to allow glucose and oxygen to diffuse through
          • Then the veins (thin walled tubes) carry low pressure blood back to the hear. Veins have thinner walls and valves to prevent backflow of blood
    • Heart disease
      • Blood vessels called the coronary arteries supply blood to the heart muscles. If they become blocked a heart attack occurs
        • Factors for heart disease
          • Smoking
          • High blood pressure
          • High levels of salt in the diet
          • High levels of saturated fat in the diet
        • Fatty deposits build up in the coronary arteries and a blood clot can form on that fatty deposit which then the blood clot can block a coronary artery
          • This means some of the heart muscle cells do not get the oxygen and nutrients they need and the cells begin to die


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