JACOPIN / SCIENCE PHOTO LIBRARY JACOPIN / SCIENCE PHOTO LIBRARY
COAGULATION, DRAWING Coagulation. When the skin is cut, a chain reaction is triggered to stop bleeding: First, a vascular spasm, a contraction of the muscle fibers in the blood vessels, occurs to help bring the wound's edges closer together. Then, the blood platelets form a haemostatic plug, reinforced with fibrin strands which also help emprison the red blood cells. The wound hardens upon drying and shrinks, evacuating blood serum and bringing the wound's edges even closer together. This is known as the biological bandage.
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