Across
- 3. A collection of tissues which perform a particular function
- 4. The single unit that living organisms are made of
- 5. There is less of this gas in exhaled air
- 6. The system used for breathing
- 7. The skeleton has these to allow us to move
- 9. This is a lubricant within a joint
- 12. This acts as a shock absorber on the end of a bone
- 15. Muscles do this to cause movement
- 16. this sheet of muscle contracts when you breathe in
Down
- 1. The attach muscles to bones and are strong
- 2. These speed up chemical reactions in cells and break down food during digestion
- 4. There is more of this gas in exhaled air
- 8. the percentage of this gas doesn't change in exhaled air
- 10. These join bone to bone and are elastic
- 11. This is released by respiration
- 13. The specific site of gas exchange
- 14. Your windpipe