B7 blood and the circulatory system

OCR 21st century B7 

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  • Created by: Sara
  • Created on: 13-01-13 19:43
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  • Blood and The Circulatory System
    • Transports various substances around the body
      • Blood carries oxygen and glucose to the muscles and takes urea and carbon dioxide away from them
    • Blood made up of lots of things
      • Plasma
        • Liquid that carries nutrients (glucose and amino acids), antibodies, hormones and waste
      • Red blood cells
        • Transports oxygen from the lungs to rest of body
        • No nucleus- packed full of haemoglobin
        • Biconcave shape- large area for exchanging oxygen
      • White blood cells
        • Helps body to  fight infection from microorganisms
      • Platelets
        • Small fragments of cells that help your blood to clot at the site of a wound
    • Double circulatory system
      • Two circuits joined together
      • First one pumps deoxygenated blood to the lungs to take in oxygen. Blood then goes to heart
      • Second one pumps oxygenated blood around the body. Blood then gives up oxygenated blood at body cells. Blood returns to heart to be pumped to lungs again
    • The heart
      • The right atrium of the heart receives dexoygenated blood (via vena cava
      • Deoxygenated blood moves through to right ventricle- pumps to lungs (via pulmonary artery)
      • Left atrium recieves oxygenated blood from the lungs (via pulmonary vein)
      • Oxygenated blood to left ventricle- pumps around body (via aorta)
        • Left ventricle wall thicker than right ventricle wall as blood needs to be pumped all over the body (right only to lungs)
      • Valves in heart prevent backflow of blood (veins also have valves)
      • Two coronary arteries (suppy heart muscle cells with blood)

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