The Immune System

1234567891011121314151617181920212223242526272829
Across
  1. 4. If pathogens enter the body, the ___ system takes action.
  2. 8. Artificial active immunity occurs through ___.
  3. 10. Chemicals in the skin, such as ___, help break bacterial cell walls.
  4. 13. ___ T cells shut down the immune response to prevent overreaction.
  5. 14. The main function of the lymph nodes is to remove ___ cells and pathogens.
  6. 16. Pathogens are microorganisms that cause ___.
  7. 18. Large white blood cells called ___ engulf pathogens.
  8. 21. Natural passive immunity occurs when a baby receives antibodies from the ___.
  9. 23. These memory cells help the body respond ___ if the same pathogen invades again.
  10. 24. T cells kill infected cells.
  11. 25. The pieces of the pathogen that trigger an immune response are called ___.
  12. 28. The ___ gland processes T cells, which play a key role in the immune response.
  13. 29. T cells coordinate the immune response.
Down
  1. 1. Acquired immunity develops after exposure to a pathogen and includes natural and ___ immunity.
  2. 2. Innate immunity is ___ and does not require prior exposure to pathogens.
  3. 3. Natural active immunity occurs through a ___ infection.
  4. 5. The body's first line of defense includes the skin, mucus, and ___.
  5. 6. The immune system is an army of cells, tissues, and ___ that work together to fight pathogens.
  6. 7. The immune system is not located in one part of the body but functions as a ___ system.
  7. 9. Lymph is a ___ or yellowish fluid that contains white blood cells.
  8. 11. The skin acts as a ___ barrier to invaders.
  9. 12. Artificial passive immunity occurs through antibody transfer, such as a ___ shot.
  10. 15. The skin also produces ___, which contains acids that kill microorganisms.
  11. 17. When a pathogen is destroyed, some T and B cells remain as ___ cells.
  12. 19. B cells produce ___ that attach to pathogens and mark them for destruction.
  13. 20. The ___ is a lymph organ that acts as a large blood filter.
  14. 22. If there are too many pathogens, the macrophages call for help from ___ and B cells.
  15. 25. Immunity is classified into two main types: innate immunity and ___ immunity.
  16. 26. The body has three main groups of lymph nodes located in the groin, armpit, and ___.
  17. 27. ___ are lymphatic tissues that help defend against infections in the throat.