Discussion
Which is the right sequence of stages of Haemostasis?
Answer: C
The right sequence is Vasoconstriction → Platelet plug formation → Coagulation → Fibrinolysis.
When a vessel is injured it first constricts to reduce blood flow. Platelets then stick to the exposed collagen and to each other, forming a temporary plug. The clotting cascade converts fibrinogen into fibrin, which reinforces the plug into a stable clot. Finally, once the vessel heals, fibrinolysis dissolves the clot.
The other options put coagulation before the platelet plug, or fibrinolysis first, which would dissolve a clot that has not yet formed.
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