Hemostasis

Which of the following describes the role of factor X in blood clotting?

• to form a plug in the hole of the damaged blood vessel

• to convert prothrombin to thrombin

• to activate clotting factor V

• to release platelet factor 3

Which one of the following blood components helps it to clot when the skin is cut?

• Red blood cells

• White blood cells

• Plasma

• Platelets

Which of the following statements about platelets is INCORRECT?

• Platelets adhere to collagen fibers of damaged tissue

• Platelets are cell fragments

• Platelets activate the clotting cascade

• Platelets are involved in clot dissolution

Which enzyme converts fibrinogen to fibrin?

• serotonin

• thrombin

• factor X

• factor XIII

What component of blood is involved in clotting?

• erythrocytes

• leukocytes

• platelets

• phagocytes

Hereditary trait that causes blood to not clot

• thrombocytopenia

• hemophilia

• leukopenia

• septicemia

this is when platelets attach to the exposed damaged wall of the blood vessels

• Platelet adhesion

• Platelet aggregation

• Platelet plug

• degranulation

What do we call it when platelets become irregular, large and stick to each other.

• Platelet adhesion

• Platelet aggregation

• Platelet plug

• degranulation

Which substance is released by platelets that causes vasoconstriction?

• Serotonin

• Thrombin

• Fibrin

• Thromboplastin

What affect does PGI2 have on platelets?

• It makes them stickier

• It inactivates them

• It Dissolves them

• It inhibits them from "sticking"