Across
- 3. Largest part in the levels of organization
- 6. When working with the circulatory system, the respiratory system allows for ___ exchange
- 8. Oxygen
- 9. Carbon dioxide is a ___ of respiration
- 12. Resistant to a particular infection or toxin
- 13. Organs are composed of ___
- 14. System that works with the circulatory system
- 15. One part of the circulatory system
Down
- 1. Smallest part in the levels of organization
- 2. The cold/flu is an ___ germ/pathogen
- 4. Red blood cells release ___ to your lungs
- 5. Another word for "spread"
- 7. ___ blood cells that are part of the immune system
- 10. An epidemic that spreads over multiple countries or continents
- 11. ___ blood cell that brings oxygen to your cells
- 12. Increased physical activity leads to ___ heart rate
- 13. Components in the circulatory system