Across
- 3. body system of organs that obtain vitally important oxygen from the outside world
- 4. body system formed by all the structures that move blood through the body
- 6. blood vessels that carry oxygen-poor blood
- 9. exchange of oxygen and carbon dioxide between the body and the air around it
- 10. hollow, muscular organ located in the center of the chest
Down
- 1. small arteries that deliver oxygen and nutrients to cells and pick up cell's waste
- 2. liquid part of blood
- 5. blood vessels that carry oxygen-rich blood
- 7. two air passages
- 8. sheet of muscle beneath the lungs and above the abdomen