T Lymphocytes
Biology: AQA A Level, topic 2.4.3
T Lymphocytes
T lymphocyte cells are white blood cells that are involved in the cellular immune response. The steps involved in this process are:
1) Detection of antigens
- The foreign antigens presented by phagocytes bind to specific receptors on the cell surface of T lymphocyte cells.
- Binding of the antigens activates the T helper cells.
2) T helper cells
- T helper (TH) cells are a specific type of T cell that activates several cells including:
- Phagocytes.
- T cytotoxic (TC) cells.
- B cells.
3) T cytotoxic cells
- TC cells are activated by TH cells.
- TC cells release toxins that bind to and kill foreign cells and abnormal cells in the body.
Test yourself on T Lymphocytes
Which of these is NOT activated by T helper cells?
Which of the following statements about T lymphocytes are true?
What is the role of T cytotoxic cells?