The Circulatory System

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Across
  1. 1. the cells that attack bacteria in blood and body tissues
  2. 4. thin-walled chambers that receive blood from veins
  3. 7. muscular organ that pumps blood through the body
  4. 8. an ear shaped appendage
  5. 11. the major muscle of respiration
  6. 13. the membrane that lines the inside of the chambers of the heart and forms the surface of the valves
  7. 14. the positively charged central core of an atom
  8. 18. the outer surface of the heart
  9. 19. controlling the passage of fluid/air through a pipe
  10. 20. the smallest subunit of all muscular tissues and organs
Down
  1. 2. long contractile fibres
  2. 3. the largest and most important artery in the body
  3. 5. the muscular tissue of the heart
  4. 6. the membrane enclosing the heart
  5. 9. the tip of a pyramidal or rounded structure
  6. 10. the red liquid that circulates in the arteries and veins
  7. 12. main chambers of the heart on left and right
  8. 15. a cavity within a bone or other tissue
  9. 16. any of the tubes forming part of the blood
  10. 17. the soft pad positioned in between each of the vertebrae of the spine