blood

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  • blood
    • blood is a tissue consisting of plasma in which: white blood cells and platelets are suspended
    • plasma (55%)
      • pale yellow fluid
      • transports co2,hormones and waste
    • red blood cells (45%)
      • carries oxygen
      • large surface area
      • no nucleus
      • full of haemoglobin
    • white blood cells(< 1%)
      • part of the immune system
      • some produce antibodies
        • others surround and engulf pathogens
    • platelets (< 1%)
      • fragments of cells
      • clump together to form blood clots

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