T cells
A)include approximately 10-15 percent of the circulating lymphocytes.
B)can differentiate into plasmocytes when appropriately stimulated.
C)are responsible for the phenomenon in the body known as "humoral immunity."
D)control the activation and activity of B cells.
E)All of the answers are correct.

Question

Quizplus · Accepted Answer

T cells control the activation and activity of B cells. T cells are also responsible for cell-mediated immunity, which differs from the humoral immunity mediated by B cells. T cells can differentiate into various effector cells, but not plasmocytes. They make up approximately 70-80% of circulating lymphocytes.

T Cells