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Colour SEM of a platelet among red blood cells

Colour SEM of a platelet among red blood cells

P242/0188

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Credit

DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY

Caption

Platelet. Coloured Scanning Electron Micrograph (SEM) of a blood platelet (thrombocyte) among red blood cells. Here, the platelet is coloured white. It has dendritic structures (pseudopodia) which project from the cell surface and in this state is "activated" (in the process of causing the blood to clot). Unactivated platelets are smooth and oval in shape. Platelets are cells without nuclei, formed in the bone marrow, which survive for about 9 days. They clump together to plug defects in blood vessels and so prevent bleeding; they also assist in clot formation. Mature red blood cells (erythrocytes) are the biconcave cells visible. Magnification: x6,800 at 6x6cm size.

Release details

Model release not required. Property release not required.

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