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