Crossword Puzzle

2. ability to resist damage from foreign substance, including microbes, toxins, and cancet cells.
5. key players in adaptive immunity, developing from stem cells in red bone marrow.
7. proteins produced by the body in response to a specific antigen.
9. release chemicals ti reduce inflammation.
12. protein secreted by cells that regulate the activity of neighboring
13. the number of antigen-bending sites on an antobody.
15. the first responders to infection, but they have a short life span.
17. situated on the posterior surface of the tongue.
18. injection of antibodies from another person or animal provides temporary immunity.
19. contains macrophanges and red blood cells connected to veins
20. any substance such ad bacteria, viruses, pollen, food or drugs that triggers an immunune response.

1. the lymphatic system play a crucial role the body's _________ against foreign substance and pathogens.
3. lymphatic tissues forming a protective ring round the nasal and oral cavity
4. function as an antigen-bending receptor on B- cells.
6. release leukotrienes and play a role in inflammation.
8. release histamine, contributing to the inflammatory response.
10. rounded structures varying in size, located near lymphatic vessels, particularly in areas like the groins, armpit and neck.
11. antibodies clump antigens together, making them easier to eliminate.
14. exposure to an antigen through natural infection leads to antibody production and long-term immunity.
16. involved in allergic reaction and defense against parasites.