Across
- 4. Alows air to pass to and from
- 8. Airways that lead from bronchi to alveoli
- 9. Upper chamber of the heart
- 11. Lower chamber of the heart
- 12. A cell fragment that forms scabs
- 13. Blood vessel that carries blood to the heart.
Down
- 1. Liquid part of blood
- 2. Passages air takes in the lungs
- 3. Smallest blood vessel
- 5. Tiny sacs of lung tissue
- 6. Where digestion begins
- 7. A tube that connects the mouth to the stomach
- 9. Blood vessel that carries blood away from the heart.
- 10. Large muscular sac that plays a role in digestion
- 11. Fingered shaped structures found on the small intestine