Across
- 3. : sends blood from the heart to the lungs and back
- 5. : abnormal heart rate
- 6. : returns blood from the upper body
- 7. : is the main artery of the heart carrying oxygenated blood to all parts of the body except the lungs
- 9. : sends blood to the rest of the body and back to the heart
- 10. : valves causes backwards flow of blood
- 11. : hardening of the arteries due to plaque
- 12. : large vein carrying deoxygenated blood back to the heart
- 13. : blockage of blood flow
Down
- 1. : skin color is determined by a chemical called melanin. if a lot of melanin is present, skin i very dark. if little melanin is present skin is very light
- 2. : are made of living and dead cells
- 4. : made the heart work harder
- 8. : returns blood from the lower body