Across
- 1. part of the heart that sets its pace for beating
- 4. low-pressure chambers in the heart
- 6. carries blood back to the heart
- 8. tissue separates the right and left sides of the heart
- 9. aorta for veins
- 11. high-pressure chambers in the heart
Down
- 2. carries blood to the organs
- 3. a type of muscle that helps the heart contract
- 5. tiny arteries that bring blood to the organ
- 7. controls blood flow in the heart chambers
- 10. the main artery leaving the heart