Final answer:
Lymphocyte recirculation ensures that naive lymphocytes continually pass through the circulatory and lymphatic systems. B cells mature in the bone marrow, while T cells mature in the thymus. Secondary lymphoid organs such as the spleen, lymph nodes, and tonsils are sites where lymphocytes congregate to mount immune responses and encounter pathogens.
Step-by-step explanation:
Lymphocyte recirculation ensures that naive lymphocytes continually pass through the circulatory and lymphatic systems.
All lymphocytes are produced in the bone marrow and then go through a process of maturation. B cells mature in the bone marrow, while T cells mature in the thymus. After maturation, both B and T lymphocytes circulate through the circulatory and lymphatic systems to search for pathogens.
Secondary lymphoid organs such as the spleen, lymph nodes, and tonsils are sites where lymphocytes congregate to mount immune responses and encounter pathogens. These organs filter lymph and store lymphocytes, allowing them to initiate adaptive immune responses.