Across
- 2. Muscular layer of the heart
- 4. Relaxation phase of the heartbeat
- 6. One of two upper chambers of the heart
- 7. One of two lower chambers of the heart
- 8. cava Largest vein in the body
- 12. Membrane that surrounds the heart
- 14. Small artery
Down
- 1. Contraction phase of the heartbeat
- 3. Small vein
- 5. Carries blood away from the heart to the rest of the body
- 7. Is a structure in the veins and the heart that closes an opening to make it that blood can flow in one direction
- 9. Carries blood from body tissues and the lungs to the heart
- 10. Largest artery in the body
- 11. Dioxide Waste in the form of gas that is released by body cells
- 13. Improper closure of the heart valves that causes a swishing sound