Hemostasis: The physiological process that stops bleeding at the site of vascular injury while maintaining blood flow elsewhere, involving vascular constriction, platelet aggregation, and coagulation.
Vascular Spasm: Immediate constriction of blood vessels following injury, reducing blood flow and limiting blood loss.
Platelet Plug Formation: Activation and aggregation of platelets at the injury site, forming a temporary plug to seal small vessel breaches.
Coagulation Cascade: A series of enzymatic reactions involving clotting factors that lead to the transformation of fibrinogen into fibrin, stabilizing the platelet plug into a durable clot.
Thrombus: A blood clot that forms locally within a blood vessel, potentially obstructing blood flow.
Embolus: A detached thrombus or other material that travels through the bloodstream and can cause blockages elsewhere, such as in the lungs or brain.
1. What is an antiplatelet agent?
2. What are the three main stages involved in the hemostasis process?
3. Which of the following clotting factors is vitamin K-dependent and plays a crucial role in the coagulation cascade?
Hemostasis — process?
Stops bleeding via vessel constriction, platelets, coagulation.
Hemostasis — process?
Stops bleeding and maintains blood flow.
Coagulation cascade — pathway?
Series of reactions forming fibrin from clotting factors.
Vascular Spasm — role?
Immediate vessel constriction after injury.
Warfarin — mechanism?
Vitamin K antagonist inhibiting clotting factor synthesis.
Platelet Plug Formation — step?
Platelet activation and aggregation.
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