factor I

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Definition

Noun: 1. A specific plasma protein involved in blood coagulation: Factor I is the scientific name for the soluble protein fibrinogen, which is a normal component of blood plasma. It is converted into insoluble fibrin by the enzyme thrombin during the process of blood clot formation.

Usage Notes
  • "Factor I" is a technical, scientific term used primarily in medicine, hematology, and biochemistry.
  • It is almost always preceded by the definite article "the" when referring to the protein itself (e.g., "the factor I level").
  • In common medical parlance, its common name, fibrinogen, is used more frequently.
Examples
  • Scientific/Medical Context:
    • A deficiency in factor I can lead to severe bleeding disorders.
    • The laboratory test measures the concentration of factor I in the patient's plasma.
    • During coagulation, factor I is converted into fibrin strands.
Advanced Usage
  • "Factor I deficiency": The medical condition resulting from low levels or dysfunctional fibrinogen, known as afibrinogenemia or hypofibrinogenemia.
    • The patient was diagnosed with congenital factor I deficiency.
Variants and Related Words
  • Fibrinogen (n): The common biochemical name for Factor I.
    • Fibrinogen is a glycoprotein synthesized in the liver.
  • Fibrin (n): The insoluble, fibrous protein that forms the mesh of a blood clot, produced when thrombin cleaves fibrinogen.
    • The clot is stabilized by a network of fibrin.
Synonyms
  • Fibrinogen: This is the direct synonym and more commonly used term in many contexts.
Related Terms (Not Synonyms)
  • Coagulation factor: The general category to which Factor I belongs. Other factors include Factor II (prothrombin), Factor VIII, etc.
  • Thrombin: The enzyme that catalyzes the conversion of fibrinogen (Factor I) to fibrin.
Noun
  1. a protein present in blood plasma; converts to fibrin when blood clots

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