Across
- 1. it prevents back blood flowing
- 2. something hard in your body
- 6. Were gas exchange happened
- 9. it forms a clot to stop blood
- 11. It is in the middle
- 13. blood cell they carry oxygen
- 14. were is splits into two ways
Down
- 1. were blood comes back to the heart
- 3. It is in the membrane
- 4. there are three layers
- 5. blood cell Which prevent from infection
- 7. theory three parts
- 8. were blood is taken away from the body
- 10. which divide them into 4 section
- 12. it is a air way