Immunity

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Across
  1. 1. Blood vessels that contain valves to prevent backflow
  2. 4. A vaccine provides this type of immunity
  3. 6. The matching relationship between antigen and antibody shapes
  4. 10. The process by which phagocytes engulf pathogens
  5. 11. The network of fibres that forms during blood clotting
  6. 13. The protein in red blood cells that carries oxygen
  7. 15. A disease that can be spread from person to person
  8. 17. Blood vessels where exchange of substances occurs
  9. 20. The movement of materials out of a cell
  10. 21. Blood vessels that carry blood away from the heart
  11. 22. The phase of the heartbeat when the chambers contract
Down
  1. 2. The type of immunity gained after an infection
  2. 3. A microorganism that causes disease
  3. 5. The large blood vessel that carries blood from the heart to the body
  4. 7. Proteins produced by lymphocytes that bind to antigens
  5. 8. An organelle containing enzymes that digest pathogens
  6. 9. The liquid component of blood that transports substances
  7. 10. White blood cells that engulf and digest pathogens
  8. 12. The movement of materials into a cell
  9. 14. A cell that remembers a pathogen for faster future response
  10. 16. The clumping of red blood cells due to incompatible blood
  11. 18. A substance on the surface of a pathogen that triggers an immune response
  12. 19. The body’s ability to resist infection