Across
- 2. Little spheres that give oxygen to blood
- 4. In the cerebral cortex of brain
- 8. In the medulla oblongata
- 9. Made up of organs that let body breathe
Down
- 1. Thin sheet under ribs and over lungs
- 3. Series of blood vessels
- 5. The part after the pharynx
- 6. Controls oxygen/carbon dioxide levels
- 7. The little chunks of the lungs