IMMUNOLOGY

Detailed explanation-1: -Lymphocytes develop in the thymus and bone marrow (yellow), which are therefore called central (or primary) lymphoid organs.

Detailed explanation-2: -T lymphocytes develop from a common lymphoid progenitor in the bone marrow that also gives rise to B lymphocytes, but those progeny destined to give rise to T cells leave the bone marrow and migrate to the thymus (see Fig. 7.2). This is the reason they are called thymus-dependent (T) lymphocytes or T cells.

Detailed explanation-3: -T cells arise from bone marrow and mature in the thymus. The thymus is a lymphatic system gland that functions principally to support the development of mature T cells (the “T “ in T cell lymphocyte stands thymus derived).

Detailed explanation-4: -The tissues and organs that produce, store, and carry white blood cells that fight infections and other diseases. This system includes the bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels (a network of thin tubes that carry lymph and white blood cells).