Platelet
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Platelets or thrombocytes are a part of blood whose function is to react to bleeding from blood vessel injury by clumping to form a blood clot. Platelets have no cell nucleus; they are fragments of cy
Image from a light microscope (500 ×) from a Giemsa-stained peripheral blood smear showing platelets (small purple dots) surrounded by red blood cells (large gray circular structures)
Platelets derive from multipotent marrow stem cells.
Platelets extruded from megakaryocytes
Scanning electron micrograph of blood cells. From left to right: human erythrocyte, activated platelet, leukocyte.
White blood cell
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White blood cells, also called immune cells or immunocytes, are cells of the immune system that are involved in protecting the body against both infectious disease and foreign entities. White blood ce
Platelet
…and NETs. Platelets rapidly deploy to sites of injury or infection. There, they are thought to modulate inflammatory processes via interactions with leukocytes and secretion of cytokines, chemokines, and other inflammatory mediators. Platelets also secrete platelet-derived growth factor (PDGF). Platelets…
Neutrophil engulfing anthrax bacteria
Eosinophil
Monocyte