Across
- 3. upper chamber of the heart
- 8. blood cell that helps fight infection
- 11. tissue that flows through the circulatory system
- 12. Blood Vessels that carry blood back to the heart
- 13. fluid portion of blood
- 14. blood vessel the connects arteries and veins
- 16. brief period of relaxation in the heart
- 17. Double layered outermost layer of the heart
- 18. Blood cell required for the clotting process
- 20. valve between the L atrium and L ventricle
Down
- 1. Valve between R vent. & pulmonary artery
- 2. Complex protein on red blood cells
- 4. vessel that carries blood away from the heart
- 5. Valve between the left ventricle and aorta
- 6. innermost layer of the heart
- 7. period of ventricular contraction in the heart
- 9. Lower chamber of the heart
- 10. Muscular middle layer of the heart
- 15. blood cell that carries hemoglobin
- 19. wall that separates the heart into right and left