What is the primary function of CD4 cells in the immune system?

CD4 cells, often referred to as helper T cells, play a crucial role in the immune system by coordinating the immune response. Their primary function is to assist other immune cells, including B cells and CD8 T cells, in responding effectively to pathogens. CD4 cells achieve this by releasing signaling molecules known as cytokines, which help to direct the immune response, enhancing the ability of B cells to produce antibodies and enabling CD8 cells to destroy infected cells.

The coordination provided by CD4 cells is vital for an effective immune response, as they help to manage and amplify the immune system's efforts against infections. Without the proper functioning of CD4 cells, the immune response can become disorganized, leading to inadequate control of infections and increasing susceptibility to diseases, including HIV-related complications.

While other immune functions, such as antibody production and the destruction of infected cells, are certainly important, they are typically reliant on the support and signaling provided by CD4 cells. Thus, the specific role of guiding and coordinating the entire immune process underscores why the primary function of CD4 cells is to help coordinate the immune response.