#1
Which of the following is NOT a component of hemostasis?
Antigen presentation
ExplanationAntigen presentation is not part of hemostasis.
#2
What is the primary function of platelets in hemostasis?
To form a plug at the site of injury
ExplanationPlatelets primarily form plugs at injury sites in hemostasis.
#3
Which blood vessel type has the thinnest walls?
Capillaries
ExplanationCapillaries have the thinnest walls among blood vessel types.
#4
What is the function of endothelial cells in blood vessels?
To regulate blood flow
ExplanationEndothelial cells regulate blood flow in blood vessels.
#5
Which of the following is NOT a function of blood vessels?
Producing hormones
ExplanationBlood vessels do not produce hormones.
#6
What is the term for the process by which blood vessels constrict to reduce blood flow?
Vasoconstriction
ExplanationThe process of blood vessels constricting to reduce blood flow is vasoconstriction.
#7
Which enzyme converts fibrinogen into fibrin during the coagulation process?
Thrombin
ExplanationThrombin converts fibrinogen to fibrin in coagulation.
#8
What is the term for the process of breaking down blood clots?
Fibrinolysis
ExplanationFibrinolysis is the breakdown of blood clots.
#9
Which of the following clotting factors is vitamin K dependent?
Factor II (Prothrombin)
ExplanationFactor II (Prothrombin) is vitamin K dependent.
#10
What is the main function of von Willebrand factor (vWF) in hemostasis?
To stimulate platelet adhesion and aggregation
ExplanationvWF stimulates platelet adhesion and aggregation in hemostasis.
#11
Which of the following is a characteristic of hemostasis?
Increased bleeding time
ExplanationHemostasis is associated with increased bleeding time.
#12
What is the primary function of anticoagulants in the bloodstream?
To prevent blood clotting
ExplanationAnticoagulants in the bloodstream prevent blood clotting.
#13
Which of the following is NOT a factor that can contribute to blood vessel dysfunction?
Antioxidant consumption
ExplanationAntioxidant consumption doesn't contribute to blood vessel dysfunction.
#14
What is the role of nitric oxide (NO) in blood vessels?
To dilate blood vessels
ExplanationNitric oxide (NO) dilates blood vessels.
#15
Which of the following is NOT a characteristic of atherosclerosis?
Decreased risk of blood clot formation
ExplanationAtherosclerosis does not decrease the risk of blood clot formation.
#16
Which of the following is a function of the lymphatic system in relation to blood vessel function?
Returning excess interstitial fluid to the bloodstream
ExplanationThe lymphatic system returns excess interstitial fluid to the bloodstream.
#17
Which of the following is NOT a risk factor for developing venous thrombosis?
Regular exercise
ExplanationRegular exercise is not a risk factor for developing venous thrombosis.
#18
What is the function of endothelin in blood vessels?
To induce vasoconstriction
ExplanationEndothelin induces vasoconstriction in blood vessels.