Question

multiple choice question
which t cell plays an integral role in both humoral and cell mediated immunity?

helper t cell
memory t cell
cytotoxic t cell
regulatory t cell

Explanation:

To solve this, we analyze each T - cell type:

• Helper T cell: Helper T cells secrete cytokines. In humoral immunity, they activate B cells to produce antibodies. In cell - mediated immunity, they activate cytotoxic T cells and other immune cells. So, they are involved in both.
• Memory T cell: Memory T cells are mainly for long - term immunity and rapid response upon re - exposure to an antigen. They don't have a direct integral role in both humoral and cell - mediated immunity in the same way as helper T cells.
• Cytotoxic T cell: Cytotoxic T cells are mainly involved in cell - mediated immunity, where they kill infected or cancerous cells. They have a limited role in humoral immunity.
• Regulatory T cell: Regulatory T cells are involved in suppressing the immune response to prevent autoimmunity. They are not integral to both humoral and cell - mediated immunity in the way helper T cells are.

Answer:

A. Helper T cell