Across
- 3. marrow — found in the center of the bones, it also produces red blood cells.
- 4. - These helps the body to remember previous invaders and recognize them if they come back to attack again.
- 8. nodes —small glands positioned throughout the body, linked by lymphatic vessels.
- 9. - These are the most common type of phagocyte and tend to attack bacteria.
- 11. - These patrol for pathogens and also remove dead and dying cells.
Down
- 1. - These cells surround and absorb pathogens and break them down, effectively eating them.
- 2. - These are the largest type and have several roles.
- 5. — a gland between the lungs and just below the neck.
- 6. — an organ that filters the blood.
- 7. cells - These have many jobs, including helping to heal wounds and defend against pathogens.
- 10. - White blood cells.