Question: A client is admitted to a health care facility with minor lacerations on the leg. The nurse caring for this client observes swelling in the tissues surrounding the affected area. A blood clot is suspected. The nurse should know that which of the following is the first step when the formation of a blood clot begins? Thrombin converts the plasma protein fibrinogen into threads The threads of fibrin form a net to entrap RBCs and platelets Platelets break down and migrate to the injured area Prothrombin activator starts to react with additional calcium ions