What is the main role of Helper T cells in the immune response?

Helper T cells play a crucial role in the adaptive immune response primarily by activating other immune cells, including B cells and Killer T cells. When Helper T cells encounter an antigen presented by antigen-presenting cells, they release cytokines, which are signaling proteins that facilitate communication between cells of the immune system.

The activation of B cells leads to the production of antibodies, which are essential for targeting and neutralizing pathogens, while the activation of Killer T cells enhances the body's ability to directly destroy infected or cancerous cells. This coordination of immune responses is vital for an effective defense against infections.

While other options mention important immune functions, they do not encompass the primary role of Helper T cells in orchestrating the immune response through the activation of both antibody-producing and cytotoxic cells. Thus, their pivotal function in ensuring a robust and multifaceted immune response is best captured by their role in activating B cells and Killer T cells.