Across
- 2. Blood components involved in clotting
- 3. Prevents blood backflow in the heart
- 6. Organ that pumps blood throughout the body
- 7. Windpipe
- 10. Exchange of gases in the body
- 13. Throat
- 15. Breathe in
- 16. Vessel carrying blood toward the heart
- 17. Voice box
- 19. Fatty substance that can clog arteries
- 22. Muscle used during breathing
- 24. Flap preventing food from entering airway
- 25. Gas essential for respiration
Down
- 1. Tiny air sacs for gas exchange in lungs
- 2. Liquid component of blood
- 4. Largest artery in the body
- 5. Breathe out
- 6. Protein in red blood cells carrying oxygen
- 8. Air passages branching into lungs
- 9. Waste gas expelled by the lungs
- 11. Upper chamber of the heart
- 12. Vessel carrying blood away from the heart
- 14. Device or tissue regulating heartbeat
- 18. Rhythmic expansion felt in arteries
- 20. Organs used for breathing
- 21. Smallest blood vessels for gas exchange
- 23. Lower chamber of the heart