Cell mediated immunity is carried out mainly by
Correct answer: D. T lymphocytes
- A. antibodies dissolved in the plasma
- B. B lymphocytes
- C. complement proteins
- D. T lymphocytes
Explanation
T cells act on cells rather than on free antigen, destroying virus infected cells, cancer cells and transplanted tissue by direct contact, which is why this branch is called cell mediated. Humoral immunity is the other branch, in which B cells give rise to plasma cells whose antibodies circulate in body fluids. The two branches cooperate, since helper T cells are needed to activate most B cells.
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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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