Ace A Level Biology 2026 – Dive Deep and Conquer Science!

T helper cells play a pivotal role in initiating the immune response by acting as a communication hub within the immune system. They are essential for the activation of other immune cells, including B cells and T killer cells. Once the T helper cells recognize antigens presented by antigen-presenting cells (APCs), they release cytokines that stimulate the immune response. This cytokine signaling amplifies the activity of the immune system, thereby ensuring a robust defense against pathogens.

While T killer cells are involved in destroying infected cells, T memory cells are responsible for providing long-term immunity by recalling past infections, and T regulator cells help in maintaining immune tolerance and preventing excessive immune responses, they do not initiate the immune response. This distinctive function of T helper cells highlights their critical role in the overall immune response, making them indispensable for the activation of the immune system.