when the skin is broken (like a wound) platelets arrive to stop the bleeding
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what do the chemicals released by platelets do?
* cause soluble fibrinogen proteins to convert into insoluble fibrin to form mesh across wound * mesh traps red blood cells and forms a clot * clot dries into a sacb
* prevents continued/significant blood loss from wounds * seals wound to prevent entry of microorganisms * remains in place until new skin has grown underneath it