Across
- 4. valve that controls blood flow from right atrium to right ventricle
- 7. blood cells that fight disease
- 10. the system that exchanges gases in and out of the body
- 12. piece of cartilage that covers trachea when eating so that food does not enter into trachea
- 13. chamber of the heart where oxygenated blood enters from the lungs
- 14. the system that covers interior and exterior body organs
- 15. fluid portion that makes up most of the blood's volume
- 16. the system that transport blood and oxygen throughout the body
- 17. muscular organ that pumps blood
- 18. sacs in the lungs where oxygen and carbon dioxide are exchanged
Down
- 1. protein molecules in blood that carry oxygen to the cells
- 2. outermost layer of the skin
- 3. blood vessels that carry blood away from the heart
- 5. chamber of heart that receives deoxygenated blood
- 6. small blood vessels that connects veins to arteries and exchange nutrients and wastes
- 8. tube that air passes through from larynx to bronchi
- 9. large blood vessel that carries blood to the rest of the body
- 11. blood vessels that carry blood to the heart
- 12. process of removing carbon dioxide air from the body
- 19. pair of the main organs of the respiratory system