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