alleryStart learning →Which factor stabilizes the fibrin clot once it has formed?
AFactor XII
BFactor XIII
CFactor VIII
DFactor II
Answer & Solution
Correct answer: B. Factor XIII
1. Thrombin makes fibrin strands from fibrinogen, completing the mesh.
2. Factor XIII, the fibrin-stabilizing factor, then stabilises that clot and slows its breakdown.
3. Factor II is prothrombin, which acts earlier and yields thrombin.
4. Factor XII initiates the intrinsic pathway and later helps in fibrinolysis, so its numbering is one digit away and it is the built-in trap.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.5 Hemostasis_
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