_____ signal other cells of the immune system to end their attacks; they stop immune response.
A. Natural killer cells
B. Regulatory T-cells
C. Helper T-cells
D. B-cells

Question

_____ signal other cells of the immune system to end their attacks; they stop immune response.
A. Natural killer cells		
B. Regulatory T-cells
C. Helper T-cells		
D. B-cells

anonymous · Answer

Natural killer cells do not, they are phagocytic; B-cells make antibodies. the answer is C. helper t cells activate other T cells and B cells.

anonymous · Answer

b Regulatory T-cellsRegulatory T (T(Reg)) cells are essential for maintaining peripheral tolerance, preventing autoimmune diseases and limiting chronic inflammatory diseases. Several sophisticated regulatory mechanisms are used to maintain immune homeostasis, prevent autoimmunity and moderate inflammation induced by pathogens and environmental insults. Chief amongst these are regulatory T (Treg) cells that are now widely regarded as the primary mediators of peripheral tolerance. the various potential suppression mechanisms of Treg cells can be grouped into four basic ‘modes of action’: suppression by inhibitory cytokines, suppression by cytolysis, suppression by metabolic disruption, and suppression by modulation of dendritic-cell (DC) maturation or function http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2665249/bin/nihms-102080-f0001.jpg http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2665249/