Breathing and Circulation

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Across
  1. 3. Mineral needed for haemoglobin to function properly
  2. 5. Liquid part of the blood
  3. 8. Tiny air sacs that are the site of gas exchange in the lungs
  4. 10. Pumps blood around the body
  5. 12. Colour of blood cells that carry oxygen
  6. 13. Carries air from the mouth to the bronchi
  7. 14. Chemical that binds oxygen in the blood
  8. 15. Sugar that is carried in the plasma
  9. 17. Tiny, thin-walled blood vessel that collects carbon dioxide from body cells.
  10. 18. Causes increase in heart rate
  11. 21. Pressure wave that travels along the walls of the arteries each time the heart beats
  12. 22. Bones that protect our heart and lungs
Down
  1. 1. Prevents backflow of blood in the circulatory system
  2. 2. Flat sheet of muscle that has a role in the breathing mechanism
  3. 4. Colour of blood cells that fight infection
  4. 6. Chamber of the heart that blood flows into
  5. 7. Platelets carry substances that help this occur
  6. 9. Blood vessel that carries blood to the heart
  7. 11. One of the functions of the blood
  8. 16. Gas that diffuses from the blood in capillaries to the body cells
  9. 19. Blood vessel that carries blood away from the heart
  10. 20. Organs for breathing