Although B and T lymphocytes originate in the bone marrow, T cells mature in the
appendix
thymus
spleen
tonsils
The Correct Answer is B
A. Appendix: The appendix contains lymphoid tissue and participates in immune surveillance, but it does not serve as a site for T cell maturation. Its role is primarily secondary immune function rather than primary lymphocyte development.
B. Thymus: T lymphocytes migrate from the bone marrow to the thymus to mature and acquire immunocompetence. The thymus provides the specialized environment for T cell differentiation, selection, and education before they enter circulation.
C. Spleen: The spleen functions as a secondary lymphoid organ where T cells encounter antigens and mount immune responses, but it does not support initial T cell maturation.
D. Tonsils: Tonsils are secondary lymphoid structures that trap antigens and facilitate local immune responses. They do not serve as a site for T cell development or maturation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Allowing the organelles to spill free from the bacteria:Bacteria do not have membrane-bound organelles, so this mechanism is not applicable. The membrane attack complex does not function by releasing organelles but targets the plasma membrane itself.
B. Disrupting the selective permeability of a bacteria's plasma membrane:The MAC forms pores in the bacterial plasma membrane, disrupting its integrity and allowing ions and water to flow uncontrollably. This loss of membrane selectivity leads to cell lysis and death, effectively killing the bacteria.
C. Penetrating the capsule of the bacteria giving antibiotic drugs access to bacterial cells:The MAC does not facilitate antibiotic entry. Its function is independent of drug therapy and directly lyses bacterial cells by forming transmembrane channels.
D. Providing a passage for antibodies to enter into the bacterial cytosol:Antibodies cannot enter bacterial cytosol via MAC. The MAC kills bacteria through pore formation that disrupts osmotic balance, not by transporting antibodies into the cell.
Correct Answer is E
Explanation
A. Lymph nodes:Lymph nodes contain both B and T lymphocytes. B cells are primarily found in the outer cortex, where they can respond to antigens and undergo clonal expansion.
B. Spleen:The spleen houses B cells in the white pulp, where they encounter antigens from the blood and can differentiate into plasma cells to produce antibodies.
C. Tonsil:Tonsils contain B cells within lymphoid follicles. They contribute to immune responses against pathogens entering through the oral and nasal cavities.
D. All of the above contain B cells:This is incorrect because not all the listed organs contain B cells. Most secondary lymphoid organs do, but the thymus is an exception.
E. Thymus:The thymus primarily supports the maturation of T lymphocytes. It does not contain B cells in significant numbers and is considered a primary lymphoid organ for T cell development.
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