Across
- 5. oxygen rich blood
- 7. wall
- 10. middle layer of heart wall
- 12. small branches of arteries
- 13. very small veins
- 14. valve between left atrium and left ventricle
- 15. artery that carries blood to the head
Down
- 1. relating to the lungs
- 2. tube part of blood circulation system
- 3. rhythmic throbbing of arteries
- 4. temporarily closes to permit blood to flow on one direction
- 6. epithelial cells
- 8. largest artery in the body
- 9. largest vein in the body
- 11. partition separating two chambers