BIOLOGY REVIEW

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Across
  1. 5. largest artery in the human body
  2. 6. tiny blood cell fragments that help stop bleeding by forming clots
  3. 7. Blood vessel that leaves the right ventricle to travel to the lung
  4. 11. substance that make person very difficult for a person to quit smoking
  5. 15. tube that carries air from the throat to the lungs
  6. 17. type of blood vessel for gas exchange and extremely thin
  7. 19. the process oxygen is inhaled and carbon dioxide is exhaled is called
  8. 20. carries oxygenated blood from the lungs to the heart
Down
  1. 1. muscle below the lungs that helps you breathe in and out
  2. 2. to prevent backflow of blood
  3. 3. layered membrane that surrounds the lungs and provides lubrication
  4. 4. chamber of the heart that pump blood to the entire body
  5. 8. blood cells that fight infections and protect the body from germs
  6. 9. oxygen and ... are needed for aerobic respiration
  7. 10. anaerobic respiration need the substance
  8. 12. smoking increases the risk of .... eye problem
  9. 13. bronchi to become restricted (get smaller) so air can't get to the lungs.
  10. 14. bronchi transport air from … to lungs
  11. 16. tiny air sacs in the lungs where oxygen enters the blood
  12. 18. exercise that strengthens the heart and improves blood circulation