MANFRED KAGE / SCIENCE PHOTO LIBRARY. MANFRED KAGE / SCIENCE PHOTO LIBRARY.
False colour scanning electron micrograph of human erythrocytes, or red blood cells, tangled in fibrin, the insoluble form of fibrinogen, a coagulation factor present in blood plasma. Fibrinogen, a normal soluable component of plasma, is converted to an insoluable protein fibrin when acted upon by the enzyme thromboplastin. Fibrin forms a fibrous meshwork, the basis of a blood clot, which is the essential mechanism for the arrest of bleeding. Red blood cells contain the pigment haemoglobin, the principal function of which is to transport oxygen around the body. Mag: X8000 (at 6x7cm size), X4000 (at 35mm size).
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