A) circle of Willis.
B) common carotid artery.
C) external carotid artery.
D) internal carotid artery.
E) basilar artery.
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A) have internal and external elastic membranes.
B) have more smooth muscle in their tunica media.
C) have a pleated endothelium.
D) have thinner walls.
E) are usually round when cut.
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A) umbilical vein.
B) ductus venosus.
C) ductus arteriosus.
D) foramen ovale.
E) umbilical arteries.
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A) arteries.
B) arterioles.
C) capillaries.
D) venules.
E) veins.
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A) pulmonary arteries
B) pulmonary veins
C) common carotid artery
D) aorta
E) superior vena cava
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A) thoracic aorta.
B) abdominal aorta.
C) celiac trunk.
D) common iliac arteries.
E) internal iliac arteries.
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A) axillary
B) inferior mesenteric
C) celiac
D) superior mesenteric
E) splenic
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A) Blood islands are primitive capillary networks formed from embryonic cells scattered within the yolk sac.
B) Blood islands are primitive arteries that are formed from hemangioblasts.
C) Blood islands are primitive veins that are formed from hemangioblasts.
D) Blood islands are aggregations of embryonic cells scattered within the yolk sac that form blood vessels and blood cells.
E) Blood islands are collections of blood cells that are formed from embryonic hematopoietic stem cells.
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A) tunica intima.
B) tunica externa.
C) tunica media.
D) tunica interna.
E) tunica adventitia.
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A) axillary
B) brachiocephalic
C) common carotid
D) aorta
E) brachial
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A) is located in the falx cerebri.
B) collects blood from the brain.
C) converges with the transverse sinus to form the sigmoid sinuses.
D) carries deoxygenated blood.
E) provides blood to the circle of Willis.
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A) axillary
B) brachial
C) cephalic
D) basilic
E) median cubital
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A) radial
B) ulnar
C) cephalic
D) basilic
E) brachial
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A) Varicose veins form when blood pressure is too high damaging the valves.
B) Varicose veins form when blood pressure is too low so the valves do not open.
C) Varicose veins form when the vein walls weaken and the valves fail so blood begins to pool in the veins.
D) Varicose veins form when the valves become stiff and fail to open.
E) Varicose veins form when sympathetic activation causes venoconstriction.
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A) brachiocephalic trunk
B) vertebral artery
C) basilar sinus
D) jugular sinus
E) carotid sinus
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A) artery
B) arteriole
C) capillary
D) venule
E) vein
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A) increase in heart rate.
B) decrease in heart rate.
C) decrease in blood pressure.
D) both decrease in heart rate and decrease in blood pressure.
E) both increase in heart rate and decrease in blood pressure.
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