Digitised-colour TEM of a human T-lymphocyte

Digitised-colour TEM of a human T-lymphocyte

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Caption: Digitised-colour transmission electron micrograph (TEM) of a human T-lymphocyte cell. Here, the cell has released some of its cytoplasm (at bottom, yellow). The nucleus is coloured purple. This is a white blood cell, and one of the component cell types of the human immune system. T-lymphocytes (T-cells) differentiate in the thymus and move to the lymph nodes and spleen. Their defensive role in the cell-mediated immune response of the body is to fight invasion by foreign micro-organisms (notably viruses and some bacteria). "Killer" T- cells can recognize foreign antigens and they release enzymes that destroy foreign invaders.


Keywords: anatomy, blood cell, cells, human body, immune, lymphocyte, t, t-lymphocyte, white, white blood cell
