Across
- 5. heart attack
- 8. returns blood from lower body
- 9. returns blood from upper body
Down
- 1. blood to lungs and back to heart
- 2. sends blood to body and back to heart
- 3. abnormal heart rate
- 4. makes heart work harder
- 6. vein carrying deoxygenated blood back to heart
- 7. oxygen and nutrients are picked up by blood
- 10. main artery of the heart