Across
- 6. Smallest arteries
- 7. Capillary walls are __________ cell thick.
- 9. Term for blood vessels getting smaller in diameter
- 10. Term for blood vessels getting larger in diameter
- 13. Blood vessels that carry blood away from the heart
- 14. Gas that we breathe in to live
- 15. What happens in the legs when the valves on veins do not work
- 16. Type of muscle inside veins and arteries
Down
- 1. Blood Vessels where exchange of nutrient, gases and waste happen
- 2. Waste gas that we exhale
- 3. Main organ of the circulatory system
- 4. Name of the fluid pumped by the heart
- 5. The inner surface of an artery
- 8. Smallest veins
- 11. Flaps of tissue inside veins that keep the blood travelling the correct direction
- 12. Blood vessels that carry blood back to the heart