A 6-year-old female is diagnosed with a bacterial infection of the respiratory system. Which of the following will most likely try to fight the antigen?
a. Antibodies
b. Cytotoxic T cells
c. Self-antigens
d. Helper T cells
ANS: A
Antibodies are produced by plasma cells that mature from lymphocytes, called B lymphocytes (B cells), in response to an antigen. Cytotoxic T cells do not respond to antigens. Self-antigens do not respond to antigens. Helper T cells do not respond to antigens.
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