Across
- 3. a gas we breathe in
- 5. two chambers at the bottom of the heart
- 6. blood vessels not visible to the naked eye
- 10. Blood flowing through the system
- 12. Temporary chest pain often after physical activity
- 13. An organ the size of a clenched fist
- 14. the state of matter of oxygen
- 15. Carries blood away from the heart
- 16. small collective chambers in the heart
- 17. Carries blood back to the heart
Down
- 1. a gas we breathe out
- 2. description of blood low in oxygen
- 4. when the heart is deprived of oxygen
- 7. description of blood high in oxygen
- 8. Significant escape of blood from the system
- 9. Largest artery in the human body
- 11. An organ which provides oxygen for the system