QS Study

T lymphocyte is a type of lymphocyte (a subtype of white blood cell) that plays a central role in cell-mediated immunity. It develops from bone marrow-derived cells that migrate to the thymus. T lymphocyte is responsible for a variety of other immune responses. There are two types of T-cells in our body: Helper T-cells and Killer T-cells. Killer T-cells do the work of destroying the infected cells. They are able to find the cells with viruses and destroy them. The Helper T-cells coordinate the attack.

Fig: T Lymphocyte Structure

The function of T lymphocyte

  • It is responsible for cell-mediated immunity.
  • Directly attacking foreign substances such as bacteria, viruses, or strange tissues;
  • Some T cell-like cytotoxic T-cell kills the foreign body.
  • Release soluble mediator lymphokines which activate tissue macrophage.
  • Responsible for rejection of transplanted tissue.
  • Producing substances called cytokines that direct responses and activities in other immune cells.