Across
- 4. flow of blood from one side of the heart to the other
- 6. heart and blood system
- 7. valve between the left atrium and right ventricle
- 9. the mildest form of a heart attack
Down
- 1. how the heart pumps deoxygenated blood to the lungs
- 2. the innermost layer of the heart
- 3. double membranes sac that surrounds the heart
- 5. cells that control the conducting system
- 8. when one blood vessel gets blocked, another blood vessel can take over
- 10. doesn’t take continued stimulation by any nerve to keep the heart muscle cells contracting