Cardiovascular

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