Across
- 3. Muscular sack
- 4. Upper chamber of the heart
- 6. Lower chamber of the heart
- 7. fights off diseases
- 9. A group of small cells that all do the same function
- 10. carries oxygen to the lungs
- 12. Carries blood away from heart
Down
- 1. helps form scab
- 2. The airway in the lungs
- 3. absorbs the most nutrients
- 4. Small sacs of lung tissue
- 5. filters waste and extra fluid
- 6. Finger like structures
- 8. Stores urine
- 11. Directs air to the lungs