Across
- 4. what is the main muscle of the respiratory system
- 6. main organ of excretory system
- 8. oxygenated blood away from heart
- 9. long fibers that lead to all parts of body from the spinal cord
Down
- 1. cellular waste
- 2. storage sack for urine
- 3. connects nerves to the whole body
- 5. liquid part of blood
- 7. main organ of nervous system