Across
- 3. specialized protein on red blood cells that carry oxygen
- 6. muscular wall that separates the heart into a right and left side
- 7. red blood cell, contains hemoglobin
- 8. heart ventricles are resting and filling
- 10. blood vessel that carries blood to the heart
- 12. one cell thick, connects arterioles with venules
- 14. largest artery in the body
- 15. takes blood away from the heart
- 16. cells required for clotting, platelets
- 20. smooth layer of cells that lines the inside of heart
Down
- 1. membranous sac that surrounds the heart
- 2. pacemaker of the heart
- 4. high blood pressure
- 5. heart attack
- 9. white blood cell, fights infection
- 11. a muscular pump
- 13. a ballooning out or a sac like formation on the wall of an artery
- 17. muscular middle layer of the heart
- 18. ventricular contraction (when the heart works)
- 19. fluid portion of the blood