Across
- 2. Tiny air sacs
- 3. The master organ of the human body.
- 4. Cord The bridge between the brain and the rest of the body.
- 7. The basic structural unit of the nervous system.
- 8. Carry blood back to the heart
Down
- 1. Carry blood back to the heart
- 3. River of life
- 5. Major organ of the respiratory system
- 6. The pumping organ of the human body