10.7 Crossword Puzzle Challenge Part 1

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Across
  1. 4. Beat of the heart as felt through the walls of the arteries
  2. 5. Small artery
  3. 9. The largest artery in the body
  4. 12. Structure in veins or in the heart that temporarily closes an opening so that blood flows in one direction
  5. 14. Innermost lining of blood vessels
  6. 16. Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells
Down
  1. 1. Double layered membrane surrounding the heart
  2. 2. One of two lower chambers of the heart
  3. 3. A small vein
  4. 6. Inner lining of the heart
  5. 7. Abnormal swishing sound caused by improper closure of the heart valves
  6. 8. Contraction phase of the heartbeat
  7. 10. Largest type of blood vessel; carries blood away from the heart to all parts of the body
  8. 11. An electronic apparatus implanted in the chest to stimulate heart muscle that is weak and not functioning
  9. 13. Thin-walled vessel that carries blood from body tissues and lungs back to the heart
  10. 15. Muscular, middle layer of the heart