20 Questions Science Crossword

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Across
  1. 1. The straw-coloured liquid found in blood
  2. 3. Also called the windpipe, this splits into two bronchioles
  3. 7. Name of the vein that carries blood to the heart
  4. 8. Another name for an air sac in the lungs
  5. 10. What heart chambers are next to the ventricles
  6. 11. This carries Oxygen in a red blood cell
  7. 12. Vessels in which gas exchange takes place?
  8. 16. What type of circulatory system do humans have?
  9. 18. Sheet of muscle below lungs that aids breathing
  10. 19. These blood vessels have a pulse
Down
  1. 1. Name of fatty deposits that contain cholesterol
  2. 2. Shape of normal red blood cell
  3. 4. What stops blood in veins flowing backwards?
  4. 5. Gas that is removed from body via lungs
  5. 6. Respiration requires oxygen and this
  6. 9. What vessels carry blood to the heart?
  7. 13. A vein that carries oxygenated blood?
  8. 14. The artery that carries fast-flowing oxygenated blood away from the heart
  9. 15. This increases your pulse and is good for you
  10. 17. These help blood to clot and scab