Across
- 1. What organ filters pathogens and old blood cells?
- 7. What type of T-cell helps activate other immune cells?
- 8. What type of T-cell destroys infected cells?
- 11. What is the system of vessels that transports lymph?
- 12. What type of leukocyte directly kills infected cells?
- 14. What chamber of the heart receives deoxygenated blood?
- 15. What valve prevents backflow into the left ventricle?
- 19. What organ is responsible for T-cell maturation?
- 20. What vessels bring blood back to the heart?
- 21. What are the smallest blood vessels?
- 24. What is the fluid that circulates in the lymphatic system?
- 26. What is another name for the circulatory system?
- 27. What is the primary organ that produces leukocytes?
- 28. What fluid circulates throughout the body?
- 29. Where are pathogens trapped and antibodies created?
- 30. What valve separates the right atrium from the right ventricle?
Down
- 2. What type of blood cell fights infections?
- 3. What type of blood cell carries oxygen?
- 4. What type of cell attacks parasites?
- 5. What chamber of the heart pumps oxygenated blood?
- 6. What type of leukocyte produces antibodies?
- 9. What blood component helps with clotting?
- 10. What type of leukocyte presents antigens?
- 13. What vessels transport blood away from the heart?
- 16. What is the liquid portion of blood called?
- 17. What valve controls blood flow between the left atrium and ventricle?
- 18. What is the main organ of the circulatory system?
- 22. What is a disease-causing microorganism called?
- 23. What type of cell is responsible for fighting infections?
- 25. What type of leukocyte engulfs bacteria?
- 27. What type of cell is responsible for allergic reactions?