When an antigen-presenting cell interacts successfully with a helper T cell, the antigen-presenting cell secretes a signal molecule that assists in the activation of the helper T cell. This signal molecule is
A)interferon.
B)complement.
C)interleukin-1.
D)perforin.

Question

Quizplus · Accepted Answer

The signal molecule secreted by the antigen-presenting cell that assists in the activation of the helper T cell is interleukin-1 (IL-1). This cytokine is a proinflammatory molecule that recruits and activates other immune cells, including helper T cells. Interferon, complement, and perforin are all involved in different aspects of the immune response, but they do not play a role in the activation of helper T cells.

When an Antigen-Presenting Cell Interacts Successfully with a Helper T