The function of T helper cells is to regulate the immune response. The cytokines they secrete exert their influence on other cell populations; most of the different effector cells of the immune system are affected by one or more of the cytokines secreted by TH cells. | The function of T helper cells is to regulate the immune response. The cytokines they secrete exert their influence on other cell populations; most of the different effector cells of the immune system are affected by one or more of the cytokines secreted by TH cells. |