Across
- 2. the main organ of the circulatory system
- 4. connect arteries and veins
- 6. a respiratory structure where air enters through the body
- 10. the gas that we exhale
- 11. the main organs of the respiratory system
- 12. supplies blood with oxygen and removes carbon dioxide
Down
- 1. transports oxygen to the body and aids in the removal of carbon dioxide
- 3. carry oxygenated blood away from the heart
- 5. where the exchange of oxygen and carbon dioxide takes place in the respiratory system
- 7. ______ blood cells fight disease
- 8. carry deoxygenated blood back towards the heart
- 9. the gas that we inhale
- 13. _____ blood cells carry oxygen into the body's cells