Across
- 2. Blood vessel where gas exchange occurs
- 5. Transports oxygen poor blood
- 6. Help to clot blood
- 9. Takes blood to lungs
- 11. Innermost layer of heart
- 12. Brings blood back from lungs
- 14. Blood cell to fight infection
Down
- 1. Middle layer of heart, muscular layer
- 3. Blood leaves heart to body through the
- 4. Lower section of heart
- 5. Blood enters heart first through the
- 7. Transports oxygen rich blood
- 8. Outer layer of heart
- 10. Upper section of heart
- 13. Blood cell with no nucleus