What are the two primary infection-fighting cells associated with the lymph nodes?

Prepare for the CDC 4N051 Aerospace Medical Exam. Explore vital concepts with flashcards and multiple-choice questions, each providing hints and explanations. Ace your exam!

The two primary infection-fighting cells associated with the lymph nodes are lymphocytes and macrophages. Lymphocytes play a key role in the adaptive immune response. They are a type of white blood cell that includes T cells and B cells, both crucial for recognizing specific pathogens and mounting a targeted immune response. T cells can kill infected host cells or help activate other immune cells, whereas B cells can produce antibodies to neutralize pathogens.

Macrophages, on the other hand, are a type of phagocytic cell that is essential for innate immunity. They not only engulf and digest pathogens and debris but also act as antigen-presenting cells that help activate T lymphocytes, linking the innate and adaptive immune responses. Their presence in the lymph nodes is vital for detecting infections and orchestrating an effective immune response.

The other options do not primarily focus on these roles; for instance, neutrophils and macrophages are important, but neutrophils are more associated with acute responses rather than the lymphatic system. Eosinophils and basophils are more involved in allergic reactions and combating parasites, while platelets and red blood cells do not play a direct role in fighting infections within the lymphatic system.

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