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Blood GCSE standard

Blood GCSE standard

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  • 1. Blood Wednesday, 11 June 2014 10:56
  • 2. Red blood cells • Carry oxygen from lungs to body tissue. • There are 5 000 000 in 1mm3 of blood. • They are adapted in the following ways: (1) Size – thick diameter but thin width. They just fit through a capillary but the surface to volume ratio is large so they can absorb a lot of oxygen. 10:56
  • 3. 10:56
  • 4. Red blood cells (2) Shape – they are concave discs – this give greater surface area. (3) No nucleus – leaves more room for haemoglobin – also no mitochondria or ribosomes. (4) Haemoglobin – this is a protein that carries oxygen becoming oxyhaemoglobin. 10:56
  • 5. 10:56
  • 6. Haemoglobin 10:56
  • 7. Oxyhaemoglobin 10:56
  • 8. White blood cells • Defend against diseases. • They ingest bacteria and viruses. • They produce antibodies. 10:56
  • 9. Human blood under microscope 10:56
  • 10. Platelets • Platelets are small cells that allow blood to clot. • This stops bleeding and prevent bacteria from entering the body. 10:56
  • 11. Plasma • This is the straw coloured liquid in the blood. • Over 90% of plasma is water. • This dissolves: (1) food – amino acids and glucose (2) cholesterol – from the liver (3) hormones – from glands (4) antibodies (5) water – to kidneys (6) waste products like carbon dioxide and lactic acid 10:56
  • 12. Plasma 10:56