Across
- 4. A system that transports blood, oxygen, and nutrients to the body
- 7. Muscular organ that pumps blood for the body
- 8. Valves allow blood to only move one direction in the heart
- 10. A colorless and odorless gas that is a natural component on Earth
Down
- 1. Blood vessels that take oxygen-poor blood to the body
- 2. chemical element essential for life
- 3. Blood vessels that take oxygen-rich blood to the body
- 5. Blood vessels that connect arteries to veins
- 6. An organ where blood can exchange carbon dioxide for oxygen
- 9. Abnormal rhythm of the heart