51.4 MB (4.6 MB compressed)
5079 x 3539 pixels
42.9 x 30.0 cm ⏐ 16.9 x 11.8 in (300dpi)
BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Clotting blood cells & fibrin. Coloured Scanning Electron Micrograph (SEM) of red blood cells enmeshed in a web of fibrin fibres (white) in clotting blood. Blood clots form when tissue damage, turbulence or chemical factors trigger the conversion of the soluble protein fibrinogen into insoluble fibres of fibrin. The fibres trap blood cells into a solid clot, sealing the wound. Red blood cells are the most abundant cells in the blood. Their colour comes from the protein haemoglobin, which picks up oxygen in the lungs and releases it around the body. Magnification x1800 at 35mm size.
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