DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Human red blood cells, monocyte (white blood cell) and activated platelets, coloured scanning electron micrograph (SEM). Red blood cells (RBCs), or erythrocytes, are the most common type of blood cell in vertebrates. They are involved in delivering oxygen to the body tissue. Monocytes are a type of white blood cell (leukocyte).They are part of the innate immune system of vertebrates. Platelets are blood cell fragments that play an essential role in blood clotting and wound repair, and can also activate certain immune responses. Platelets are blood cell fragments that play an essential role in blood clotting and wound repair. They are the body's first line of defence against excessive blood loss. When an injury such as a cut is sustained, platelets change their shape (now known as activated platelets), become sticky and build up on a vessel wall to form a plug. Magnification: x1,200 when shortest axis printed at 25 millimetres.
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