Across
- 1. Atrium's little ears
- 3. the muscle layer of the heart
- 6. the pacemaker cells
- 7. Deliver blood to the body tissues
- 10. cardiac muscle cells formed a work union
- 11. when blood valves narrow
Down
- 2. electrolyte that makes the heart contract
- 4. mother sinus of the heart
- 5. Deliver blood to the heart
- 6. No need for nervous stimulation to contract
- 8. the crappy heart's song
- 9. node that electrifies