Circulatory System

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Across
  1. 2. Membrane that holds heart.
  2. 5. Outermost layer of heart wall.
  3. 8. Protein in RBCs carry oxygen.
  4. 11. Production of RBCs and platelets.
  5. 12. Chambers of heart.
  6. 13. Test to evaluate heart.
  7. 15. The process forms a blood clot.
  8. 16. When muscle relaxes during heartbeat.
  9. 17. Name of conducting fibers.
  10. 18. Middle layer of heart wall.
Down
  1. 1. Long, tough protein in chains.
  2. 3. Connect adjacent cardiac muscles.
  3. 4. Breakdown of fibrin in blood clots.
  4. 6. Blood enters ventricles of heart.
  5. 7. Small vein.
  6. 9. Dilation of blood vessels.
  7. 10. Muscle contracts during heartbeat.
  8. 13. Innermost layer of heart wall.
  9. 14. Force of blood against walls.