Circulatory System - The Blood

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  • The Blood
    • Red Blood Cells
      • Carry oxygen from the lungs to all cells in the body.
      • Concave shape.
        • large surface area/more room for absorbing oxygen.
      • No nucleus.
        • large surface area/more room for absorbing oxygen.
      • Contains a red pigment called plasma.
      • In the lungs, haemoglobin combines with oxygen to become oxyhaemoglobin.
        • In body tissue oxyhaemoglobin splits up into haemoglobin and oxygen, to release oxygen into the cells.
    • White Blood Cells
      • Defence against disease.
        • Engulf harmful microorganisms
        • Produce antibodies to fight microorganisms.
        • Produce antitoxins to neutralise any toxins produced by the microorganisms.
      • Unlike red blood cells, they do have a nucleus.
    • Platelets
      • Small fragments of a cell that have no nucleus.
      • They help the blood to clot a wound - to stop blood loss and prevent harmful microorganisms getting in.
        • Lack of platelets can cause excessive bleeding and bruising.
      • Lack of platelets can cause excessive bleeding and bruising.
    • Plasma
      • Carries everything in the blood.
        • Red blood cells.
        • White blood cells.
        • Platelets
        • Nutrients like glucose and amino acids. (soluble products of digestion which are absorbed from the gut and taken to the cells of the body.
        • Carbon Dioxide from the organs to the lungs
        • Urea - from the liver to the kidneys
        • Hormones
        • Antibodies and antitoxins produced by the white blood cells.

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