Introduction to Hemostasis

Front

What is hemostasis?

Back

Hemostasis is the process of blood clot formation to stop bleeding following a blood vessel injury.

Front

What are the two main processes involved in hemostasis?

Back

Coagulation (formation of blood clot) and Fibrinolysis (lysis of the clot after repair).

Front

What are the major systems involved in hemostasis?

Back

Blood vessel, platelets, coagulation proteins, fibrinolysis, and serine protease inhibitors.

Front

What are the minor systems involved in hemostasis?

Back

Kinin system and complement system.

Front

What is primary hemostasis?

Back

Primary hemostasis refers to the response to vascular injury that produces a platelet plug at the site of damage.

Front

What are the steps involved in primary hemostasis?

Back

1. Vasoconstriction 2. Platelet adhesion 3. Platelet activation 4. Platelet aggregation 5. Platelet secretion 6. Platelet plug formation.

Front

What is the role of vasoconstriction in hemostasis?

Back

Vasoconstriction narrows the blood vessel lumen to reduce blood flow at the injury site.

Front

What is platelet adhesion?

Back

Platelet adhesion is the process where circulating platelets adhere to exposed collagen fibers of the subendothelium.

Front

What factors are involved in platelet aggregation?

Back

Ionized calcium (Ca2+), fibrinogen receptors (glycoprotein Ib-IIIa complex), and fibrinogen.

Front

What is secondary hemostasis?

Back

Secondary hemostasis involves the enzymatic activation of coagulation proteins to produce fibrin from fibrinogen.