2 Structures and Functions in Living Organisms (Single Award) (Part 3)

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Across
  1. 2. Thin, narrow blood vessels that are the site of exchange of substances between the blood and the tissues.
  2. 5. Cells of the immune system that protect the body from invading pathogens via the production of antibodies and antitoxins.
  3. 6. The small airways branching from the bronchi in each lung.
  4. 9. An organ that pumps blood around the body in a double circulatory system.
  5. 10. A tissue containing red blood cells, white blood cells, platelets and plasma.
  6. 11. The airtight membranes covering the lungs and the chest wall.
  7. 14. Tiny fragments of cells found in the blood that are involved in clotting.
  8. 15. The straw-coloured liquid in blood that transports carbon dioxide, urea, digested food, hormones and heat energy.
  9. 16. The two lower chambers of the heart that receive blood from the atria and expel blood into the arteries.
  10. 17. A transport tissue found in plants which is specialised to transport sugars from sources to sinks.
  11. 18. A type of blood vessel that carries blood at high pressure away from the heart to the tissues.
  12. 19. The two airways branching from the trachea that lead into the lungs.
  13. 20. The main artery that takes oxygenated blood away from the heart to the body.
  14. 24. The main vein that carries oxygenated blood back to the heart from the lungs.
  15. 25. Tiny air sacs in the lungs that serve as the gaseous exchange surface.
Down
  1. 1. The windpipe connecting the lungs to the mouth and nose.
  2. 3. Groups of muscles situated between the ribs. They are responsible for the movement of the ribs during breathing.
  3. 4. Cells in the blood that transport oxygen. They have a biconcave shape, no nucleus, and contain haemoglobin.
  4. 7. The muscle separating the thorax and the abdomen.
  5. 8. A type of white blood cell that ingests pathogens.
  6. 12. A type of white blood cell that produces specific antibodies against a pathogen.
  7. 13. A blood vessel that carries blood at low pressure back to the heart.
  8. 14. The main artery that takes deoxygenated blood away from the heart to the lungs.
  9. 20. The two upper chambers of the heart that receive blood from the veins and pump blood into the ventricles
  10. 21. The red protein found in red blood cells that transports oxygen in the blood.
  11. 22. An immune cell that can recognise a pathogen previously encountered (either from infection or vaccination) and produce specific antibodies against the pathogen quickly.
  12. 23. The main vein that takes deoxygenated blood back to the heart from the body.