Q. Which of the following substances, if introduce in the blood stream, would cause coagulation, at the site of its introduction ?
A) Fibrinogen
B) Prothrombin
C) Heparin
D) Thromboplastin
Explanation
[Solution from source] Thromboplastin (tissue factor) starts the clotting cascade, which leads to thrombin formation and turns fibrinogen into fibrin, so a clot forms where it is introduced. Fibrinogen and prothrombin already circulate in plasma without clotting, and heparin is an anticoagulant. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.