Across
- 4. sac surrounding the heart
- 6. heartbeat
- 7. the heart lies in this cavity
- 8. largest artery
- 10. arteries supplying blood to head and neck
- 11. infarction (heart attack)
- 13. one of the upper chambers of the heart
- 15. phase of heartbeat (relaxation)
- 16. one of the lower chambers of the heart
Down
- 1. waxy substance narrowing arteries
- 2. quarts of blood in the body
- 3. only artery that carries oxygen-deficient blood
- 5. records electrical changes in the heart
- 9. not enough oxygen
- 12. small branches of arteries
- 14. phase of heartbeat (contraction)
- 17. a waste product