Human red blood cells, monocyte (white blood cell; green) and activated platelets, coloured scanning electron micrograph (SEM). Red blood cells (RBCs), or erythrocytes, are involved in delivering oxygen to the body tissue. Monocytes are a type of white blood cell (leukocyte) and part of the innate immune system. Platelets are blood cell fragments that play an essential role in blood clotting and wound repair. 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, 000 when shortest axis printed at 25 millimetres.
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