B lymphocytes develop immunocompetence in the
lymph nodes
spleen
thymus
bone marrow
The Correct Answer is D
A. Lymph nodes: Lymph nodes serve as sites where B lymphocytes encounter antigens and become activated, but they do not confer immunocompetence. They primarily function in filtering lymph and supporting the immune response rather than the initial development of B cells.
B. Spleen: The spleen acts as a secondary lymphoid organ where B cells can encounter blood-borne antigens and participate in immune responses. However, it does not provide the environment for B cells to acquire immunocompetence initially.
C. Thymus: The thymus is essential for T lymphocyte maturation and development of immunocompetence, but it is not involved in B cell maturation. B cells do not pass through the thymus during their development.
D. Bone marrow: B lymphocytes develop immunocompetence in the bone marrow, where they undergo differentiation and selection processes to ensure functional antigen receptors. This primary lymphoid organ provides the necessary environment for B cells to acquire the ability to recognize specific antigens before entering circulation.
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Related Questions
Correct Answer is A
Explanation
A. Thymus:The thymus is largest and most active during childhood, producing T lymphocytes and establishing adaptive immunity. With age, it gradually atrophies and is replaced by fatty tissue, leading to reduced production of new T cells in older adults.
B. Appendix:The appendix contains lymphoid tissue, but it does not undergo significant atrophy with age. Its lymphoid function persists, albeit reduced, and it remains structurally present throughout life.
C. Spleen:The spleen retains its structure and immune functions throughout life. Although some immune efficiency may decline with age, it does not undergo true atrophy like the thymus.
D. Tonsils:Tonsils may undergo partial shrinkage after adolescence, but this is variable, and they do not exhibit the pronounced age-related atrophy characteristic of the thymus.
E. Lymph nodes:Lymph nodes may decrease slightly in size with aging, but they generally remain functional throughout life and do not atrophy to the same extent as the thymus.
Correct Answer is D
Explanation
A. The two main types are T cells and macrophages:Macrophages are phagocytic cells, not lymphocytes. The main lymphocyte types are T cells and B cells, which have distinct roles in adaptive immunity.
B. T cells are the only form of lymphocyte found in lymphoid tissue:Both T cells and B cells are present in lymphoid tissues. Lymphoid organs support the activation, proliferation, and differentiation of multiple lymphocyte types.
C. T cells are the precursors of B cells:T cells and B cells develop separately from hematopoietic stem cells. T cells do not differentiate into B cells; they have distinct lineages and functions in immunity.
D. B cells produce plasma cells, which secrete antibodies into the blood:B cells differentiate into plasma cells upon activation. Plasma cells are specialized for antibody production, releasing large amounts of antigen-specific antibodies into the circulation, making this statement correct.
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