MCQ IN MEDICINE

Detailed explanation-1: -Lymphoid Stem Cells, also called Common Lymphoid Progenitor Cells, give rise to a class of leukocytes known as lymphocytes, which include the various T cells, B cells, and natural killer (NK) cells, all which function in immunity.

Detailed explanation-2: -Lymphocytes are mature, infection-fighting cells that develop from lymphoblasts, a type of blood stem cell in the bone marrow. Lymphocytes are the main cells that make up lymphoid tissue, a major part of the immune system. Lymphoid tissue is found in lymph nodes, the thymus gland, the spleen, the tonsils, and adenoids.

Detailed explanation-3: -Lymphocytes arise from stem cells in bone marrow, and differentiate in the central lymphoid organs (yellow), B cells in bone marrow and T cells in the thymus.

Detailed explanation-4: -The development and activation of T and B cells. The central lymphoid organs, where lymphocytes develop from precursor cells, are labeled in yellow boxes. Lymphocytes respond to antigen in peripheral lymphoid organs, such as lymph nodes or spleen.

Detailed explanation-5: -Chapter Review Hemopoiesis begins in the red bone marrow, with hemopoietic stem cells that differentiate into myeloid and lymphoid lineages. Myeloid stem cells give rise to most of the formed elements. Lymphoid stem cells give rise only to the various lymphocytes designated as B and T cells, and NK cells.