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How does plasmin help remove blood clots after healing?
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Blood sediment in test tubes, showing plasma (clear fluid), red blood cells (red), and the release of hemoglobin into the surrounding plasma (pink).
Plasmin plays a critical role in the body's fibrinolytic system, which is responsible for the dissolution of blood clots as wounds heal.1
The process functions as follows:
- Activation: Plasmin is derived from plasminogen, an inert protein precursor. This conversion is triggered by activating factors, such as tissue plasminogen activator, which are released from endothelial cells at the site of the clot.21
- Fibrinolysis: Once activated, plasmin acts as an enzyme that catalyzes the breakdown of fibrinβthe structural protein mesh that holds a clot together.21
- Regulation: By degrading fibrin and fibrinogen into smaller products, plasmin effectively dissolves the clot. To prevent excessive breakdown of blood components, circulating plasmin is typically inhibited by specific plasmin inhibitors when it is present in the bloodstream outside of a clot.1