When you accidentally get a minor cut on your finger, the bleeding usually stops quickly. How does the body plug wounds to stop blood flowing?
Our blood contains a substance called thrombin. When blood starts flowing from a cut, thrombin combines with a protein called fibrinogen that is found in blood plasma (the liquid part of the blood) to form needle-like crystals called fibrin. These fibrin fibers form a mesh over the wound Blood corpuscles get trapped in the mesh and this results in a plug we call a blood clot.
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