Across
- 5. Phase when the heart contracts
- 7. Pulse felt in the wrist artery
- 10. Main organ that pumps blood
- 11. Lower chambers of the heart
- 13. Protect sac around the heart
- 14. The natural pacemaker of the heart
- 17. Resting heart phase
- 20. Tiny vessels where exchange of gases occurs
Down
- 1. Muscle layer of the heart
- 2. The largest artery
- 3. It is the sound of the heart
- 4. Protein in Rbc that carries ocygen
- 6. Chamber that pumps blood to the lungs
- 8. Vessels that carry blood to the heart
- 9. Upper chambers of the heart
- 12. Chamber that receives blood from lungs
- 15. Blood vessels that carry blood away from the heart
- 16. Gas carried by red blood cells
- 18. Valve between left atrium and ventricle
- 19. Red liquid that flows in vessels