Question

secondary lymphoid organs or tissuses

Answer 1

In our body we have two primary lymphatic organs: the red bone marrow and the thymus gland.the development of WBC is section of blood.here T-cell and B-cells are 'born' in the bone marrow.

Secondary lymphoid tissues

Secondary lymphoid tissues are arranged as a series of filters monitoring the contents of the extracellular fluids, i.e. lymph, tissue fluid and blood. The lymphoid tissue filtering each of these fluids is arranged in different ways. Secondary lymphoid tissues are also where lymphocytes are activated.

These include: lymph nodes, tonsils, spleenETC.