Across
- 6. allows the blood to flow in only one direction
- 7. includes the heart and blood vessels
- 8. muscular organ that pumps blood
- 9. carry blood and nutrients to the heart
Down
- 1. carry blood and nutrients away from the heart
- 2. a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in human
- 3. connect arteries and veins
- 4. exchange gases to remove carbon dioxide and add oxygen to blood
- 5. carried away from the heart
- 7. carried to the heart