Across
- 3. chambers that receive blood.
- 5. blood vessels that have valves
- 6. heart initiates and maintains its own rhythm is said to be
- 8. muscular wall that separates the heart
- 10. muscles of the heart
- 12. carry blood under high pressure
- 13. form in which oxygen is transported in the blood.
Down
- 1. chamber that pumps blood under high pressure
- 2. initiates the heart rhythm
- 4. structure that separates opens from the left atrium
- 7. muscular organ that pumps blood
- 9. artery that supplies the heart muscles with nutrients
- 11. fight against infections