Biology

• Platelets


  • Small fragments of cells
  • Allow the blood to clot at the site of a wound to stop bacteria entering through the wound
• Red blood cells


  • Contain haemoglobin
  • Attach to oxygen, delivering it to all body cells for respiration
• White blood cells


  • Protect the body against harmful microorganisms called pathogens
• Lymphocytes


  • Produce antibodies which attach to pathogens
• Phagocytes


  • Engulf and digest pathogens
• Blood plasma


  • Yellow liquid
  • Transports all your blood cells and other dissolved substances around the body
  • Carries waste carbon dioxide produced by the cells to the lungs
  • Transports small, soluble products of digestion from the small intestine
  • Carries urea, a waste product, to the kidneys where it is removed from the blood to form urine