Lymph nodes contain B and T cell germinal centers and antigen presenting cells like dendrites and macrophages. these lymphocytes come in contact with draining lymph from afferent sites through nearby lymphatic vessels. 

Secondary Lymphoid Tissues

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

The spleen filters and stores blood and immune factors and removes damaged red blood cells. It is a critical site for B and T cell activation as it contains crucial antigen presenting cells like macrophages and dendritic cells.

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