Across
- 3. the protein that carries oxygen to the heart and carbon dioxide to the lungs
- 5. single nucleus
- 6. contain histamine and heparin
- 9. occurs between only the heart and the lungs
- 12. muscle located under the rib cage that causes the rib cage to expand and contract, making air passage easier
- 14. innermost layer that prevents blood from clotting
- 15. Largest structure of the heart
- 17. red blood cells
- 19. occurs between the heart and every part of the body except the lungs
- 20. a mixture of cells, cell fragments, and fluid along with particles of fat, other nutrients, and dissolved gasses
- 21. made of tissue and elastic fibers
- 23. made of muscle and elastic fibers that contract and expand to help blood flow
Down
- 1. tiny blood vessels that transport blood to and from cells
- 2. blood vessels that carry blood away from the heart
- 4. usually spherical with bumps on the outside
- 7. passage used to bring air into the lungs
- 8. air sacs at the end of bronchioles
- 9. 2 basic components of blood
- 10. One of the main functions of the heart
- 11. any substance that can cause your immune system to produce antibodies against it
- 13. 2 larger chambers
- 14. U shaped
- 16. 2 smaller chambers of the heart
- 18. clear yellow fluid that makes up 55% of the blood
- 22. carry blood from the rest of the body back to the heart