Question

Antigen is engulfed by these cells, digested and bound to

MHC II molecules which are placed on the surface of the
antigen presenting cell. The antigen presenting cells interact with _____________. The T helper cell binds the antigen and this triggers a series of events that eventually activates the B and
Tc cells to perform their functions in adaptive immunity.

Answer 1

Antigen presenting cells interact with naïve CD4+ T cells, leading to their activation. These activated T cells then help activate B cells and CD8+ T cells, while helper T cells secrete cytokines that further stimulate immune responses.

Step-by-step explanation:

Antigen presenting cells interact with naïve CD4+ T cells (Helper T cells) which recognize antigens bound to MHC II molecules on the surface of these cells. Specifically, the activation of T cells is a critical step in the adaptive immune response. Upon the engagement of MHC II molecules by the T cell receptor on naïve CD4+ T cells, the T cells become activated. Clones of the activated helper T cells then assist in activating B cells and CD8+ T cells, which differentiate into cytotoxic T cells capable of killing infected cells. Additionally, helper T cells secrete cytokines that are essential for the activation and proliferation of B cells, leading to the production of antibody-secreting plasma cells and memory B cells.