Across
- 5. ____ Circuit; Carries oxygenated blood
- 8. Blood clotting
- 9. Tissue barrier that separates the heart in two
- 10. Protective layer surrounding the heart
- 11. Percentage of red blood cells
- 12. Relaxation of the heart muscle
Down
- 1. Lower chambers of the heart
- 2. ____ Circuit; Carries deoxygenated blood
- 3. Thickest layer of the heart
- 4. Cells that protect the body from foreign substances
- 6. Transports oxygen, waste, and hormones
- 7. Upper chambers of the heart
- 9. Contraction of the heart muscle
- 10. The fluid matrix of blood
- 11. Pump of the cardiovascular system