thrombin
Definition
Noun: * A clotting enzyme: Thrombin is a specific enzyme in the blood plasma. Its primary function is to cause blood clotting by converting the soluble protein fibrinogen into insoluble fibrin strands.
Usage Examples
- Noun:
- Thrombin is a key component of the coagulation cascade.
- The formation of thrombin from its precursor, prothrombin, is a critical step in hemostasis.
- Surgeons sometimes apply topical thrombin to control bleeding during operations.
Advanced Usage
- "Thrombin generation": The process by which thrombin is produced in the blood, often measured to assess clotting function.
- The test measures the patient's potential for thrombin generation.
- "Thrombin time" (TT): A laboratory test that measures how long it takes for a clot to form after thrombin is added to a blood plasma sample.
- An elevated thrombin time may indicate a problem with fibrinogen.
Variants and Related Words
- Prothrombin (n): The inactive precursor or zymogen of thrombin.
- Vitamin K is necessary for the synthesis of prothrombin in the liver.
- Antithrombin (n): A substance that inhibits the action of thrombin, helping to prevent excessive clotting.
- Heparin works by activating antithrombin.
Synonyms
- Coagulation factor IIa: The systematic name for thrombin, identifying it as the activated form of factor II in the coagulation cascade.
- Clotting enzyme: A descriptive term highlighting its functional role.
Related Phrases
- Thrombin receptor: A protein on the surface of cells that thrombin binds to, initiating various cellular responses.
- Platelet activation is mediated through the thrombin receptor.
Noun
-
an enzyme that acts on fibrinogen in blood causing it to clot
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