Across
- 3. damages your lungs & heart, making it harder to do their jobs
- 7. system includes: heart, arteries, veins
- 9. -rich blood is sent to muscles to fuel exercise
- 10. the number of minutes you should exercise daily
Down
- 1. carry oxygen-rich blood away from the heart
- 2. system includes: lungs, airways to help you breathe
- 4. beats faster during exercise to keep up with our bodies increasing oxygen demand
- 5. how many lungs do we have
- 6. this body part is the beginning of our respiratory system
- 8. carry blood with carbon dioxide to the heart