The first step in haemostasis is the formation of a blood clot.

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The first step in haemostasis is vasoconstriction, which occurs to reduce blood flow to the injured area. This is followed by platelet plug formation, in which platelets become activated and stick together at the site of injury to form a plug. The final step is blood clotting or coagulation, in which the clotting factors in the blood work together to form a fibrin clot to reinforce the platelet plug.

The First Step in Haemostasis Is the Formation of a Blood