NEET Class neet Answered

T cells (thymus cells) and B cells (bone marrow cells) are the major cellular components of the adaptive immune response. T cells are involved in cell-mediated immunity, whereas B cells are primarily responsible for humoral immunity (relating to antibodies).

A young B-cell, called a naive B-cell, circulates in the bloodstream, usually ending up in the spleen or lymph nodes. These settle down mostly in the spleen and lymph nodes to pump out antibodies. Some of the activated B-cells become memory B-cells, which have very long lives in the bone marrow, lymph nodes and spleen.