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50.2 MB (50.0 MB compressed)
6379 x 2752 pixels
54.1 x 23.4 cm ⏐ 21.3 x 9.2 in (300dpi)
D & L GRAPHICS / SCIENCE PHOTO LIBRARY D & L GRAPHICS / SCIENCE PHOTO LIBRARY
Platelet activation. Artwork showing the activation of a platelet, or thrombocyte. Platelets are fragments of white blood cells that under normal circumstances are small and biconcave in form. However, if there is a break in the surface of a blood vessel the platelets come into contact with molecules they are not used to (including thrombin, blue) and become activated. They become amorphous in form, with long projections (pseudopodia) that help them to adhere to the blood vessel and each other, forming a clot over the site of the break.
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