TRANSPORT IN ANIMALS

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Across
  1. 3. strong tissue that prevents valves turning inside out
  2. 6. blood pressure as heart contracts
  3. 8. vessel carrying blood back towards the heart
  4. 9. controls the rate of a heartbeat - sometimes artificially
  5. 11. circulation for the lungs
  6. 12. main vein of the body
  7. 15. receiving chamber for blood from the body
  8. 17. tiny blood vessel for exchange of materials between blood and tissues
  9. 18. the main artery
  10. 20. vessels that carries blood away from the heart
  11. 21. operation to get past a blocked coronary artery
Down
  1. 1. pumping chamber of the heart forcing blood to the body
  2. 2. can be raised by stress or excitement
  3. 4. blood pressure as the heart relaxes
  4. 5. structure that ensures one-way blood flow
  5. 7. this can increase the risk of heart disease, as well as damage the lungs
  6. 10. benefits the heart, but too much can be dangerous
  7. 13. lipids which may block blood vessels
  8. 14. tissue that contracts as the heart, beats
  9. 16. count of the beats of the heart
  10. 19. artery supplying the heart muscle with oxygen and glucose