Indicate true (T) and false (F) statements below regarding lymphocytes in the adaptive immune system. Your answer would be a four-letter string composed of letters T and F only, e.g. TTFF.
( ) To induce an adaptive immune response, an invading pathogen must invade a peripheral lymphoid organ.
( ) Lymphocytes continuously circulate between central and peripheral lymphoid organs.
( ) Upon encountering its specific antigen in a peripheral lymphoid organ, a lymphocyte remains there to proliferate and differentiate into effector and memory cells.
( ) Memory B and T cells do not recirculate, but rather remain in the peripheral lymphoid organ in which they develop.

Question

Indicate true (T) and false (F) statements below regarding lymphocytes in the adaptive immune system. Your answer would be a four-letter string composed of letters T and F only, e.g. TTFF.
( )	To induce an adaptive immune response, an invading pathogen must invade a peripheral lymphoid organ.
( )	Lymphocytes continuously circulate between central and peripheral lymphoid organs.
( )	Upon encountering its specific antigen in a peripheral lymphoid organ, a lymphocyte remains there to proliferate and differentiate into effector and memory cells.
( )	Memory B and T cells do not recirculate, but rather remain in the peripheral lymphoid organ in which they develop.

Quizplus · Accepted Answer

Pathogens or their products are carried to a peripheral lymphoid organ via the blood or lymph, usually by dendritic cells. The process of recirculation between peripheral lymphoid organs and the bloodstream greatly increases the chance that a lymphocyte will encounter its specific foreign antigen-usually a pathogen or one of its products. Both naïve and memory B and T cells take advantage of this recirculation to police the body; once activated in a peripheral lymphoid organ, they differentiate into effector cells and memory cells.

Indicate True (T) and False (F) Statements Below Regarding Lymphocytes