Final answer:
T cells originate from the bone marrow and mature in the thymus. Helper T cells activate other immune cells, while cytotoxic T cells kill infected or aberrant cells.
Step-by-step explanation:
T cells are made in the bone marrow but mature in the thymus. There are different types of T cells, including helper T cells and cytotoxic T cells (also known as killer T cells). Helper T cells cannot directly kill cells; instead, they activate other immune cells that can, such as cytotoxic T cells, which do the actual killing of infected or cancerous cells. T cells are made in the bone marrow but mature in the thymus. There are different types of T cells, including helper T cells and cytotoxic T cells (also known as killer T cells). Helper T cells cannot directly kill cells; instead, they activate other immune cells.