Across
- 1. Brings blood from lungs
- 2. Heart muscle
- 5. Feed heart muscle
- 6. Main artery from heart
- 10. Heart inner lining
- 12. Tiny network of blood vessels
- 13. Lower heart chambers
Down
- 1. Carries blood to lungs
- 3. Upper heart chambers
- 4. Carries blood to heart
- 7. Carries blood to heart
- 8. Immune system gland
- 9. Heart’s natural pacemaker
- 11. Heart covering