T lymphocytes are so named because they mature in the
Correct answer: B. thymus gland
- A. tonsils
- B. thymus gland
- C. thyroid gland
- D. tissue fluid
Explanation
Both kinds of lymphocyte originate in the bone marrow, but T cells travel to the thymus, where those that would attack the body's own antigens are eliminated and the rest acquire their receptors. B cells complete their maturation in the bone marrow itself, which supplies the other letter. The thymus is large in childhood and shrinks after puberty, once the T cell repertoire is established.
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About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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