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Valentin [98]
3 years ago
9

After the skin is cut and a capillary wall breaks, what's the first step in working to form a clot?

Biology
1 answer:
tigry1 [53]3 years ago
3 0
The best answer is A. As soon as the blood vessel wall is broken or damaged, a series of reactions activate platelets so that they stick to the site of injury. The platelets are able to hold to the blood vessel wall by means of a protein substance called von Willebrand's factor. Collagen and thrombin then act at the site of injury and induce platelets to clump or stick together, forming a mesh that plugs the broken part. Special clotting protein help sequester more platelets to the plug which finally becomes a blood clot.
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