Circulatory and Respiratory System
Across
- 5. letting air out
- 6. delicate blood vessels that exist throughout your body
- 9. pressure of circulating blood against the walls of blood vessels
- 13. a harmful waste gas that you need to get out
- 15. small, colorless cell fragments in blood to form clots and stop bleeding
- 17. a disease that makes it difficult to breathe
- 18. a dome shped muscle
- 19. where the gas exchange occurs
- 20. red blood cells, carry oxygen throughout the body
Down
- 1. tiny air sacs surrounded by blood vessels and capillaries
- 2. protein that has iron which makes the transport of oxygen easier
- 3. sends air to lungs
- 4. bring air in
- 7. blood vessels that carry oxygen rich blood to organs
- 8. brings oxygen and nutrients to all parts of the body so it can keep moving
- 10. invisible gas inside the body which allows the cells to function properly
- 11. main function of the respiratory system, which in complex animals is responsible for carrying air to the lungs
- 12. (verb) pulls together
- 14. where oxygen moves into, carbon dioxide moves out
- 16. blood vessels that carry deoxygenated blood back to the heart