The cascade of events in the intrinsic pathway can be set into motion when _____ comes into contact with collagen.
A. factor III
B. factor VII
C. factor X
D. factor XII
E. calcium
(
Question 2) Aspirin inhibits platelet plug formation by
A. blocking the binding of platelets to collagen.
B. interfering with the synthesis of prostaglandins.
C. blocking the effects of serotonin.
D. making the platelet surface less sticky.
E. stimulating the release of heparin.
(
Question 3) During platelet plug formation,
A. platelets stick to the exposed collagen fibers of injured vessels.
B. activated platelets release fibrinogen.
C. thrombin is released from endothelial cells.
D. vitamin K production increases.
E. platelets multiply.
(
Question 4) The nervous system and certain chemicals can cause the constriction of a blood vessel. This is known as
A. platelet adhesion.
B. vascular spasm.
C. hemostasis.
D. coagulation.
(
Question 5) In the platelet release reaction,
A. factor XII is activated.
B. ADP and thromboxanes stimulate other platelets to become activated.
C. activated platelets are connected by fibrinogen.
D. prostaglandin production is inhibited.
E. platelets convert to fibrin.
(
Question 6) What protein forms a bridge between exposed vessel wall collagen and platelet surface receptors?
A. thromboxanes
B. von Willebrand factor
C. endothelin
D. fibrinogen
(
Question 7) Macrophages are derived from
A. neutrophils.
B. lymphocytes.
C. monocytes.
D. basophils.
E. eosinophils.
(
Question 8) A person with an increased eosinophil count might be suffering from
A. a parasitic worm infection.
B. a viral infection.
C. an acute bacterial infection.
D. a chronic bacterial infection.
E. a head cold.
(
Question 9) Which of the following is a stage of hemostasis?
A. coagulation
B. erythropoiesis
C. platelet formation
D. vascular dilation
E. agglutination
(
Question 10) Which of the following cell types is incorrectly matched with its description?
A. neutrophils - most numerous WBCs
B. basophils - release histamine
C. lymphocytes - become macrophages
D. monocytes - largest of the WBCs
E. eosinophils - attack worm parasites
Quick Reply
