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WorksheetsHemostasis
Total questions: 10
Worksheet time: 5mins
What is the SECOND step in the three phases of haemostasis?
vascular phase
intrinsic pathway
extrinsic pathway
platelet phase
Which of the following statements about platelets is INCORRECT?
Platelets adhere to collagen fibers of damaged tissue
Platelets are cell fragments of megakaryocytes
Platelets activate the clotting cascade
Platelets are involved in clot dissolution
In haemostasis, which molecule polymerises to become the insoluble blood clot?
factor X
thrombin
fibrin
plasmin
What is the first factor formed as a result of the extrinsic and intrinsic pathways of clot formation?
fibrin
thrombin
factor X
factor XIII
Which enzyme converts fibrinogen to fibrin?
serotonin
thrombin
factor X
factor XIII
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 statement below about role of vitamin K in blood clotting is true?
It helps in activation of all clotting factors
It dissolves fibrin meshwork
It is an antagonist of warfarin
It activates anti-thrombin III
Hemophilia B is a disease caused by a deficiency of which clotting factor?
Factor II
Factor V
Factor VIII
Factor IX
Which of the following is the effect of von Willebrand disease?
Prolonged bleeding time
Prolonged clotting time
What is the main mechanism of action of heparin in blood clotting?
Inhibits factor XIII
Increases activity of anti-thrombin III
Dissolves fibrin
Promotes clot retraction
