Coloured TEM of a human monocyte white blood cell

Coloured TEM of a human monocyte white blood cell

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Credit: BIOPHOTO ASSOCIATES/SCIENCE PHOTO LIBRARY

Caption: Monocyte. Coloured Transmission Electron Micro- graph (TEM) of a section through a human monocyte, the largest type of white blood cell. At upper centre is a large bilobed nucleus (red) which is a characteristic feature of monocytes. The cytoplasm is filled with small lysosomes. Cytoplasmic pro- jections occur on the cell surface, which enable the cell to be mobile. Monocytes have little function in blood, but by being mobile they migrate into tissues where they are known as histiocytes or macrophages. In tissues, they scavenge and engulf cellular debris and foreign micro-organisms. As such they play a part in the initial phase of the body's immune response.

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Keywords: anatomy, blood cell, cells, defence, human body, immune, immunology, leucocyte, leukocyte, macrophage, monocyte, system, white, white blood cell

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