Across
- 2. things that are useless in your body
- 3. the system that my questions are related to
- 6. pump pump
- 7. the thing that you breath out
- 9. breathing in and out is called __________
Down
- 1. the title to your crossword
- 4. what does your heart do?
- 5. something that goes through your mouth
- 6. the number of times the heart beats per minute
- 8. tubes which the blood flow