LIFE SCIENCE

Detailed explanation-1: -The thymus gland is the primary lymphoid organ for lymphocyte development. The red bone marrow produces B-lymphocytes (B cells) and T lymphocytes (T cells). B cells achieve immunocompetence (ability to recognize a specific antigen) in bone marrow. T cells migrate to the thymus gland, where they become immunocompetent.

Detailed explanation-2: -There are two main types of lymphocytes: B cells and T cells. The B cells produce antibodies that are used to attack invading bacteria, viruses, and toxins. The T cells destroy the body’s own cells that have themselves been taken over by viruses or become cancerous.

Detailed explanation-3: -T cells comprise the largest percentage of lymphocytes. These cells originate in the bone marrow, and then migrate to the thymus to become immunocompetent, or activated. When properly stimulated, T cells differentiate into several different cell types that will attack antigens and increase the body’s immune response.