A clot that breaks away from a vessel wall and circulates freely within the bloodstream is called a(n): 13:38 Biology Chapter 10 A clot that breaks away from a vessel wall and circulates freely within the bloodstream is called a(n): A) embolus B) fibrin C) thromboplastin D) thrombus E) clotting cascade Answer: a Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+