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Lec. 7: Blood Groups, Hemostasis, and Blood Coagulation

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Lec. 7: Blood Groups, Hemostasis, and Blood Coagulation

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Questions and Answers

What is the primary function of hemostasis?

To prevent and stop bleeding, keeping blood within a damaged blood vessel (correct)
To promote bleeding from damaged blood vessels
To dissolve blood clots that have already formed
To stimulate platelet aggregation

What is the first response of the blood vessel to hemostasis?

Vascular spasm (correct)
Fibrinolysis
Blood clotting
Platelet plug formation

What prevents blood clotting in intact blood vessels?

Heparin-like molecule and thrombomodulin (correct)
Plasminogen
Fibrinogen
Thrombin

What is the function of nitric oxide and prostacyclin in hemostasis?

To inhibit platelet aggregation (A) Signup and view all the answers

What is the purpose of the platelet plug in hemostasis?

To form a temporary seal to cover the break in the vessel wall (A) Signup and view all the answers

What is the final step in the hemostasis process?

Blood coagulation, or formation of a fibrin clot (C) Signup and view all the answers

What is the primary function of vasoconstriction in hemostasis?

To reduce blood flow through the injured area and limit blood loss (A) Signup and view all the answers

What is the role of collagen in hemostasis?

To promote platelet adhesion to the injury site (A) Signup and view all the answers

What is the primary function of platelets in hemostasis?

To form a platelet plug and then degranulate (D) Signup and view all the answers

What is the result of the coagulation cascade in hemostasis?

Formation of a Fibrin mesh around the platelet plug (A) Signup and view all the answers

What is the term for the process of platelet plug formation and degranulation?

Primary hemostasis (C) Signup and view all the answers

What is the term for the step that involves the formation of a Fibrin mesh around the platelet plug?

Secondary hemostasis (D) Signup and view all the answers

What is the immediate consequence of the formation of prothrombin activator in the blood coagulation process?

Conversion of prothrombin to thrombin (D) Signup and view all the answers

Which of the following is NOT a mechanism that initiates clotting?

Release of histamine from mast cells (A) Signup and view all the answers

What is the role of ionic Ca++ in the conversion of prothrombin to thrombin?

It causes the conversion of prothrombin to thrombin in the presence of prothrombin activator (D) Signup and view all the answers

What is the final product of the clotting process?

A mesh of platelets, blood cells, and plasma (A) Signup and view all the answers

What is the primary function of thrombin in the blood coagulation process?

To act as an enzyme to convert fibrinogen into fibrin fibers (B) Signup and view all the answers

What is the initial step in the clotting process?

Formation of prothrombin activator (B) Signup and view all the answers