Across
- 5. cell that contains a nucleus and destroys invading microbes
- 6. cells that initiate blood clotting and do not have a nucleus
- 9. The upper chambers of the heart. Receives blood from the body and the lungs
- 11. A flap that prevents food from entering the trachea
- 12. The waste product given off in the gas exchange between air and blood in the alveoli
- 13. cell that delivers oxygen throughout the body
- 18. The system that transports nutrients, wastes, and chemical messengers throughout the body
- 19. The element that we need to live
- 20. Air filled sacs covered by capillaries and is the site of gas exchange
- 21. Blood vessel that carry blood from the body cells back to the heart
Down
- 1. Wind pipe that is lined with cartilaginous rings, cilia, and mucus. It is covered by the epiglottis
- 2. Tiny blood vessels that connect arteries and veins. Smallest blood vessels in the circulatory system
- 3. A strong muscle that contracts and relaxes to move air in and out of the lungs
- 4. Branches from the bronchi. Branch and re-branch into small vessels
- 7. C6H12O6+O2=CO2+H2O
- 8. All processes that supply oxygen to the cells of the body for the breakdown of glucose and the elimination of waste (CO2)
- 10. The lower chambers of the heart. Pump blood out of the heart
- 14. Movement of particles from an area of high concentration to an area of low concentration
- 15. The respiratory organ which takes in and releases air
- 16. Two tube like structures branching from the trachea
- 17. Blood vessels that carry blood away from the heart