Which of the following does not contain B cells?
lymph nodes
spleen
tonsil
all of the above contain B cells
thymus
The Correct Answer is E
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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Related Questions
Correct Answer is A
Explanation
A. The flu has several strains that change seasonally:Influenza viruses undergo frequent mutations, leading to new strains each season. Because memory cells from previous vaccinations may not recognize these new strains, annual vaccination is required to provide effective immunity against the current circulating strains.
B. Exposure to flu vaccine produces no memory cells from proliferating B-lymphocytes:The flu vaccine does stimulate memory B cells, but its effectiveness can be reduced due to antigenic variation in the virus. The need for seasonal vaccination is not because memory cells fail to form, but because the virus changes frequently.
C. The polio virus is substantially weaker than the flu virus:The strength or virulence of the virus is not the reason for the difference in vaccination schedules. Polio vaccines induce long-lasting immunity because the virus does not mutate rapidly like influenza.
D. The flu vaccine is substantially weaker than the polio vaccine:Vaccine potency does not explain the need for annual flu shots. The primary reason is the frequent mutation of influenza viruses, not the inherent strength or weakness of the vaccine itself.
Correct Answer is A
Explanation
A. Lymph nodes:Lymph nodes are small, encapsulated secondary lymphoid organs located along lymphatic vessels. They filter lymph, trap pathogens, and provide sites for lymphocyte activation, making them essential for immune surveillance.
B. Lymph follicles:Lymphoid follicles are dense collections of lymphocytes found within secondary lymphoid organs such as lymph nodes, tonsils, and the spleen. They are not individual organs but structural components within organs.
C. Lacteals:Lacteals are specialized lymphatic capillaries in the small intestine that absorb dietary fats. They are part of the lymphatic system but are not lymphoid organs.
D. Lymphatics:Lymphatics refer to the network of lymph vessels that transport lymph throughout the body. They are conduits rather than discrete secondary lymphoid organs.
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