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The internal carotids and the basilar artery are interconnected by an anastomosis called the


A) common carotid artery.
B) basal ring.
C) cerebral arterial circle.
D) external carotid artery.
E) arterial bypass.

F) C) and D)
G) A) and D)

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Each of the following changes will result in increased blood flow to a tissue except


A) increased hematocrit.
B) increased vessel diameter.
C) increased blood pressure.
D) decreased peripheral resistance.
E) relaxation of precapillary sphincters.

F) B) and E)
G) C) and D)

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Elderly individuals are more prone than younger individuals to have all of the following,except


A) hypertension.
B) venous thrombosis.
C) increased elasticity of vessel walls.
D) varicose veins.
E) arteriosclerosis.

F) A) and C)
G) B) and D)

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What structure do RBCs move through single-file?


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

F) C) and E)
G) B) and E)

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Veins from the spleen,pancreas,and internal border of the stomach unite to form the


A) celiac trunk.
B) hepatic portal vein.
C) splenic vein.
D) gastric vein.
E) superior mesenteric vein.

F) None of the above
G) A) and E)

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Which of the following equations shows the correct relation between blood flow (F) ,pressure (P) ,and resistance (R) ?


A) P = (F × R) × 4
B) F = R/P
C) F = P + R
D) F = P - R
E) F = P/R

F) B) and E)
G) C) and D)

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The main control of peripheral resistance occurs in the


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

F) A) and B)
G) B) and D)

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Arteriosclerosis can lead to


A) hypertension.
B) stroke.
C) coronary artery disease.
D) myocardial infarction.
E) All of the answers are correct.

F) A) and C)
G) D) and E)

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Venoconstriction reduces the diameter of which vessel?


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

F) B) and C)
G) A) and E)

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Which of the following layers of a vessel contains collagen fibers with scattered bands of elastic fibers?


A) tunica intima
B) external elastic membrane
C) tunica media
D) internal elastic membrane
E) tunica externa

F) B) and D)
G) C) and D)

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Venous valves are responsible for


A) preventing anterograde flow.
B) channeling blood away from the heart.
C) channeling blood toward the heart.
D) preventing blood from re-entering a ventricle.
E) regulating blood pressure in veins.

F) A) and E)
G) All of the above

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Capillaries with a perforated lining are called


A) perforated capillaries.
B) discontinuous capillaries.
C) fenestrated capillaries.
D) sinuses.
E) vasa vasorum.

F) None of the above
G) A) and B)

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After the precapillary arteriole,blood enters a(n)


A) venule.
B) anastomosis.
C) precapillary sphincter.
D) capillary bed.
E) thoroughfare channel.

F) A) and D)
G) C) and D)

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A(n) ________ is a direct connection between an arteriole and a venule.


A) arteriovenule joint
B) collateralization
C) arteriovenus anastomosis
D) arteriovenule junction
E) arch

F) A) and D)
G) B) and D)

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After entering the arm,the axillary artery becomes the ________ artery.


A) radial
B) ulnar
C) brachial
D) subclavian
E) digital

F) B) and D)
G) A) and E)

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Which of the following affects blood flow through the body?


A) blood viscosity
B) turbulence
C) vascular resistance
D) vessel diameter
E) All of the answers are correct.

F) B) and C)
G) A) and C)

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Which of the following statements is false concerning the movement of fluid between capillaries and interstitial space?


A) Blood hydrostatic pressure forces fluid from the capillary to the interstitial space.
B) Blood osmotic pressure moves fluid from the interstitial space to the capillary.
C) The osmotic pressure of the interstitial fluid is less than the blood osmotic pressure.
D) The hydrostatic pressure of the interstitial fluid is largely unimportant in determining fluid movement.
E) The net filtration pressure is usually zero.

F) A) and B)
G) A) and C)

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Increased levels of carbon dioxide in the blood will result in decreased


A) heart rate.
B) cardiac output.
C) blood flow to the lungs.
D) parasympathetic stimulation of the heart.
E) sympathetic stimulation of the heart.

F) B) and C)
G) A) and E)

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The blood vessel that supplies blood to the pancreas,the small intestine,and most of the large intestine is the


A) celiac artery.
B) inferior mesenteric vein.
C) hepatic portal vein.
D) gastric vein.
E) superior mesenteric artery.

F) B) and C)
G) A) and B)

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   Figure 21-1 Arteries Use Figure 21-1 to answer the following questions: -Identify the arteries labeled  9.  A) axillary B) brachiocephalic C) common carotid D) aorta E) brachial Figure 21-1 Arteries Use Figure 21-1 to answer the following questions: -Identify the arteries labeled "9."


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

F) B) and E)
G) A) and B)

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