Biology - Body Fluids and Circulation Question with Solution | TestHub
Which of the following statements is INCORRECT about the mechanism of blood clotting ?
Options:
Answer:
Solution:
The mechanism of blood clotting involves a cascade of reactions with various clotting factors.
Injured tissues and platelets release thromboplastin, which helps in the formation of the enzyme thrombokinase. Thrombokinase inactivates heparin (an anticoagulant) and catalyzes the conversion of inactive prothrombin into active thrombin.
Thrombin then converts soluble fibrinogen into insoluble fibrin threads, which form the clot.
The clotting factors are numbered from I to XIII. Among these, Factor VI is unassigned and is not in active use (it was previously thought to be the active form of Factor V). Factor VII (Proconvertin or Stable factor) is an essential component of the extrinsic pathway of blood coagulation and is very much in active use.
Therefore, the statement 'Factor VII is not in active use' is incorrect.
Answer: Factor VII is not in active use.
