Transport in mammals

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Across
  1. 4. they have thick, muscular walls which pump blood through the arteries
  2. 6. white blood cells which attack pathogens by producing antibodies
  3. 7. the substance that bathes the cells in the body
  4. 11. ventricles contract from the bottom of the heart
  5. 13. blood vessel with valves that transports blood to the heart
  6. 15. changes in the oxygen dissociation curve as a result of carbon dioxide levels
  7. 16. the process of recognising and engulfing a pathogen
  8. 17. tiny blood vessels with walls one-cell thick where exchange of materials occurs
Down
  1. 1. atria and ventricles contract and relax in an irregular manner
  2. 2. blood passes through the heart twice
  3. 3. conducts the excitation down the septum of the heart
  4. 5. carbon dioxide + haemoglobin
  5. 8. contracts and relaxes without receiving signals from the nervous system
  6. 9. often leave the blood by squeezing through capillary walls
  7. 10. a protein found in the red blood cells
  8. 12. blood vessels that carry blood away from the heart
  9. 14. transports carbon dioxide, digested food, urea, hormones and heat