What is a key function of T helper cells in the adaptive immune response?

• A. Producing antibodies
• B. Facilitating activation of other immune cells
• C. Directly destroying infected cells
• D. Producing memory cells

Answer: (B)

T helper cells play a crucial role in the adaptive immune response by facilitating the activation of other immune cells, which is essential for mounting an effective immune response. They achieve this primarily through the secretion of various cytokines that help orchestrate the activity of other immune cells, such as B cells and cytotoxic T cells.

When T helper cells recognize a specific antigen presented by antigen-presenting cells, they become activated and proliferate. These activated T helper cells then release signaling molecules that encourage B cells to differentiate into plasma cells that produce antibodies, and they also assist in the activation and proliferation of cytotoxic T cells that directly kill infected or tumor cells. This collaborative interaction is fundamental for ensuring that the immune response is robust and well-coordinated, making T helper cells key facilitators in the immune response.

In contrast, other options pertain to functions that are either performed by different types of immune cells or are secondary effects rather than direct actions of T helper cells. For example, while producing antibodies is a function of B cells, T helper cells support this process but do not produce antibodies themselves. Directly destroying infected cells is primarily the role of cytotoxic T cells, and memory cells are formed following activation of B and T cells, but this