Across
- 1. The ____ bones protect internal organs such as the heart and lungs
- 4. The organ where oxygen and carbon dioxide are exchanged
- 7. _____ carries oxygen, nutrients, water, and waste materials
- 8. The lungs expel carbon dioxide when we ____ air
- 10. The ____ functions to support the body
Down
- 2. _____ are tubes that allow blood to flow
- 3. When we ____ air, oxygen enters the lungs and is absorbed into the blood vessels
- 5. The ____ protects our brain from injury
- 6. The meeting point between two or more bones
- 9. The organ that pumps blood to the lungs and the whole body