Across
- 3. Ventricles contract, there are four phases
- 5. Valve between right atrium and right ventricle
- 7. Valve between left ventricle and aorta
- 8. Middle muscle layer of heart
- 9. Valve between left atrium and left ventricle
- 11. innermost layer of heart
- 13. Main artery, carries oxygenated blood to the body
- 14. Another word for fainting
- 15. Flap over the top of trachea
Down
- 1. Type of heart cell, causes muscle contraction
- 2. Also known as the windpipe
- 4. Outermost layer of the heart
- 6. Type of heart cell, conducts electrical impulses
- 10. Valve between right ventricle and pulmonary artery
- 12. Ventricles relax and fill with blood