A child's thymus gland is fully formed and proportionately larger than an adult's. Which of the following processes that contributes to immunity takes place in the thymus gland?
A) Differentiation of B cells
B) Production of natural killer (NK) cells
C) Proliferation of T cells
D) Filtration of antigens from the blood
Ans: C
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Phenotypically immature T cells enter the thymus from the bone marrow and undergo maturation and thymic selection. B cells are not differentiated in the thymus, and NK cells result from the common lymphoid progenitor. The spleen filters antigens from the blood.
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