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The two vertebral arteries fuse to form a large artery,the


A) circle of Willis.
B) common carotid artery.
C) external carotid artery.
D) internal carotid artery.
E) basilar artery.

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Compare and contrast the blood contained within the pulmonary arteries to that within the systemic arteries.

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Blood in the pulmonary arteries is movin...

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Compared to arteries,veins


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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The fetal structure that conducts blood from the right to left atrium is the


A) umbilical vein.
B) ductus venosus.
C) ductus arteriosus.
D) foramen ovale.
E) umbilical arteries.

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After blood leaves the capillaries,it enters the


A) arteries.
B) arterioles.
C) capillaries.
D) venules.
E) veins.

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During exercise,the blood flow to the active skeletal muscles is increased by autoregulation.How does this work? What other controls on blood flow operate?

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When a skeletal muscle becomes more acti...

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Which of the following break(s) the rule that arteries carry oxygenated blood away from the heart?


A) pulmonary arteries
B) pulmonary veins
C) common carotid artery
D) aorta
E) superior vena cava

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The umbilical arteries branch from the


A) thoracic aorta.
B) abdominal aorta.
C) celiac trunk.
D) common iliac arteries.
E) internal iliac arteries.

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  Figure 19-2 -Identify the artery labeled  16.  A) axillary B) inferior mesenteric C) celiac D) superior mesenteric E) splenic Figure 19-2 -Identify the artery labeled "16."


A) axillary
B) inferior mesenteric
C) celiac
D) superior mesenteric
E) splenic

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What are blood islands,and from which cells do they form?


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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The muscular layer of a blood vessel is the


A) tunica intima.
B) tunica externa.
C) tunica media.
D) tunica interna.
E) tunica adventitia.

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  Figure 19-2 -Identify the arteries labeled  9.  A) axillary B) brachiocephalic C) common carotid D) aorta E) brachial Figure 19-2 -Identify the arteries labeled "9."


A) axillary
B) brachiocephalic
C) common carotid
D) aorta
E) brachial

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All of the following is true of the superior sagittal sinus except that it


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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  Figure 19-1 -Identify the vein labeled  9.  A) axillary B) brachial C) cephalic D) basilic E) median cubital Figure 19-1 -Identify the vein labeled "9."


A) axillary
B) brachial
C) cephalic
D) basilic
E) median cubital

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Trace the path of a drop of blood from the left ventricle to the right hip joint.

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left ventricle - ascending aor...

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The ________ vein is a deep vein that ascends along the medial side of the forearm.


A) radial
B) ulnar
C) cephalic
D) basilic
E) brachial

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What factors are involved in the formation of varicose veins?


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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Name the arterial structure in the neck region that contains baroreceptors.


A) brachiocephalic trunk
B) vertebral artery
C) basilar sinus
D) jugular sinus
E) carotid sinus

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RBCs move single file through this structure.


A) artery
B) arteriole
C) capillary
D) venule
E) vein

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An increase in the rate of action potentials from baroreceptors will lead to


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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