Across
- 3. The primary organ responsible for the maturation of T cells
- 7. The fluid that circulates through the lymphatic system
- 9. A specialized cell that presents antigens to T cells
- 13. A condition characterized by a deficiency of red blood cells or hemoglobin
- 14. Small proteins released by cells to communicate with and regulate the immune system
- 15. A hormone that stimulates red blood cell production
- 17. The largest lymphatic organ involved in the filtration of blood and immune system activation
- 18. The protein responsible for carrying oxygen in red blood cells
- 20. The process by which white blood cells move towards the site of infection
Down
- 1. The most numerous type of white blood cell
- 2. The first line of defense in the immune system, including physical and chemical barriers
- 4. The process of blood cell formation
- 5. The iron-containing pigment in red blood cells that binds to oxygen
- 6. The liquid component of blood
- 8. The process of stopping bleeding or hemorrhage
- 10. A cell fragment involved in blood clotting
- 11. A type of white blood cell that engulfs pathogens
- 12. Protective proteins produced by B cells in response to specific antigens
- 16. A type of lymphocyte that directly kills infected cells
- 19. The percentage of blood composed of red blood cells