Across
- 1. Dinner for Mr. Macrophage
- 2. where white blood cells are made
- 4. molecule needed for metabolic work
- 6. secreted proteins with a purpose
- 8. tiny air sacs in the lungs
Down
- 1. the engulfing of invasive pathogens
- 3. two's a crowd
- 5. a respiratory passage in the body
- 7. protective slime in respiratory system