What is a "helper T cell"?

A helper T cell, also known as a "CD4+ T cell", is a crucial component of the immune system in the human body. These specialized immune cells play a central role in coordinating and regulating immune responses. Helper T cells recognize specific antigens presented by antigen-presenting cells and release signaling molecules called cytokines to activate and direct other immune cells, such as B cells and cytotoxic T cells. By providing essential instructions and support to other immune cells, helper T cells help orchestrate the immune response against infections, facilitate the production of antibodies, and enhance the immune system's ability to eliminate pathogens. Their role as mediators of immune responses makes helper T cells vital for effective immune defense.