icantspeakengles
25.10.2019 •
Biology
Select the best explanation of how a t cell uses either cell-to-cell contact or chemical signaling to enhance the activities of the immune system.
a.chemicals called cytokines are secreted from t cells to signal production of antibodies by b cells.
b.the second exposure of the antigen causes the t cell to activate memory t cells.
c.the pathogen is engulfed by a t cell and its antigenic markers are displayed on its surface.
d.the t cell stimulates the antigen-presenting cell to release chemicals called cytokines to stimulate the cytotoxic t cells.
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Ответ:
-Some cells present parts of an pathogen that they thing should be eliminated.This is, for example, what dendritic cells do.
-T helper cells recognize those parts and starts to produce cytokines.
- Those cytokines secreted will stimulate other cells to produce more or to activate.
- B cells, which produce antibodies, will bestimulated by cytokines released by T helper cells.
Ответ: