lymphatic - System- and- Immunity

3. situated on the posterior surface of the tongue.
6. Found in secretions like saliva, tears, and mucus, protecting body surfaces.
8. Functions as an antigen-binding receptor on B cells.
10. Involved in allergic reactions and defense against parasites.
13. Antibodies bind to antigens, preventing them from interacting with cells.
14. Upon re- exposure to the same antigen, memory cells rapidly divide and produce a faster and more robust antibody response.
16. Antibodies clump antigens together, making them easier to eliminate.
17. The lymphatic system plays crucial role in the body's defense against foreign substances and pathogens.
18. Proteins produced by the body in response to a specific antigen.
19. The initial exposure to an antigen leads to B cell activation, proliferation, and differentiation into plasma cells and memory cells.
20. Proteins secreted by cells that regulate the activity of neighboring cells.

1. Any substance, such as bacteria, viruses, pollen, food, or drugs, that triggers an immune response.
2. is the body's ability to resist damage from foreign substances.
4. The fluid that circulates within lymphatic vessels, composed of water and solutes.
5. The number of anti-binding sites on antibody.
7. The substance that flow easily because of increased intermolecular spaces and do not have fixed shape.
9. Found near the internal opening of the nasal cavity.
11. Located on each side of the oral cavity.
12. Key players in adaptive immunity, developing from stem cells in red bone marrow.
14. An organ about the size of a clenched fist, located in the abdomen.
15. Antibodies coat antigens, enhancing phagocytosis by phagocytic cells.