A thrombus is defined as which of the following?

A thrombus is defined as which of the following?

• A. A blood clot that forms in place within a vessel
• B. Blood clot abnormally forming in a vessel
• C. A clot or fragment dislodges and travels in the bloodstream
• D. Atherosclerotic plaque buildup

Answer: (B)

Thrombus refers to a blood clot that forms in place within a vessel (in situ) and remains attached at the site of formation. It arises from activation of the coagulation cascade and platelet aggregation at a vascular site, often in response to endothelial injury, stasis, or hypercoagulability. This is distinct from an embolus, which is a clot or fragment that dislodges and travels through the bloodstream to lodge elsewhere. Atherosclerotic plaque buildup is not a thrombus; it’s a lipid-rich lesion in the vessel wall that can predispose to thrombus formation but is a different process. So the defining idea is a clot that forms locally within the vessel rather than traveling.

Thrombus refers to a blood clot that forms in place within a vessel (in situ) and remains attached at the site of formation. It arises from activation of the coagulation cascade and platelet aggregation at a vascular site, often in response to endothelial injury, stasis, or hypercoagulability. This is distinct from an embolus, which is a clot or fragment that dislodges and travels through the bloodstream to lodge elsewhere. Atherosclerotic plaque buildup is not a thrombus; it’s a lipid-rich lesion in the vessel wall that can predispose to thrombus formation but is a different process. So the defining idea is a clot that forms locally within the vessel rather than traveling.