Across
- 4. Organ that pumps blood
- 6. Tiny air sacs in the lungs
- 8. Lower chamber of the heart
Down
- 1. Number of chambers the heart has
- 2. Upper chamber of the heart
- 3. Vessel that carries blood to the heart
- 5. Number of lobes the right lung has
- 6. Vessel that carries blood away from the heart
- 7. Gas taken in by the lungs