ch 21 ex3

5. The layer between the tunica media and the tunica externa in a large artery is the A) tunica intima. B) external elastic membrane. C) tunica media. D) internal elastic membrane. E) tunica externa.

B

1. The muscular layer in the wall of a blood vessel is the A) tunica intima. B) tunica externa. C) tunica media. D) tunica interna. E) tunica adventitia.

C

18. You would expect to find fenestrated capillaries in A) skeletal muscles. B) cardiac muscle. C) the pituitary. D) bone. E) skin.

C

13. Venoconstriction ________ the amount of blood within the venous system, which ________ the volume in the arterial and capillary systems. A) doubles; decreases B) reduces; increases C) decreases; doubles D) increases; reduces E) reduces; reduces

B

16. The layer of the arteriole wall that can produce vasoconstriction is the A) tunica adventitia. B) tunica media. C) tunica intima. D) tunica externa. E) tunica mater.

B

17. Relative to the lumen, which of these vessels has the thickest tunica media? A) arteries B) arterioles C) capillaries D) venules E) veins

B

25. Which kind of vessel is also called a resistance vessel? A) artery B) arteriole C) capillary D) venule E) vein

B

27. The common iliac artery is an example of which type of artery? A) arteriolar B) elastic C) connective D) muscular E) vascular

B

12. Which of the following is the innermost layer of a blood vessel? A) tunica intima B) external elastic membrane C) tunica media D) internal elastic membrane E) tunica externa

A

17. Of the following arteries, the one that is an elastic artery is A) the subclavian artery. B) the external carotid artery. C) the brachial artery. D) the femoral artery. E) the ulnar artery.

A

3. Capillaries that have a complete lining are called A) continuous capillaries. B) fenestrated capillaries. C) sinusoidal capillaries. D) sinusoids. E) vasa vasorum.

A

4. The smallest arterial branches are called the A) precapillary arterioles. B) arterioles. C) capillaries. D) venules. E) veins.

A

9. Which layer of a blood vessel contains concentric sheets of smooth muscle tissue? A) tunica intima B) external elastic membrane C) tunica media D) internal elastic membrane E) tunica externa

C

28. Which of the following lumen diameters would be typical of a muscular artery? A) 0.2 mm B) 1.0 cm C) 0.4 mm D) 0.4 cm E) 1.5 cm

D

6. The thoroughfare channel ends at the A) artery. B) arteriole. C) capillary. D) venule. E) vein.

D

8. After blood leaves the capillaries, it enters the A) arteries. B) arterioles. C) capillaries. D) venules. E) veins.

D

10. The large vessels that return blood to the heart are called A) arteries. B) arterioles. C) capillaries. D) venules. E) veins.

E

15. Venae cavae are the largest of what type of vessel? A) artery B) arteriole C) capillary D) venule E) vein

E

20. Factors that increase the risk of atherosclerosis include which of the following? A) high cholesterol B) lack of exercise C) smoking D) obesity E) All of the answers are correct.

E

24. Exchange between a blood vessel and the cells that surround it can occur only in A) arteries. B) arterioles. C) veins. D) venules. E) capillaries.

E

29. Venoconstriction reduces the diameter of which vessel? A) artery B) arteriole C) capillary D) venule E) vein

E

7. 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

E

14. 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.

C

19. A sample of tissue displays many large flattened spaces lined by fenestrated endothelium. Blood moves slowly through these spaces. This tissue sample most likely came from the A) heart. B) lungs. C) liver. D) kidneys. E) skin.

C

21. These vessels may be continuous or fenestrated. A) arteries B) arterioles C) capillaries D) venules E) veins

C

22. What structure do RBCs move through single file? A) artery B) arteriole C) capillary D) venule E) vein

C

23. Capillaries with a perforated lining are called A) perforated capillaries. B) discontinuous capillaries. C) fenestrated capillaries. D) sinuses. E) vasa vasorum.

C

26. Blood flow through a capillary is controlled by the A) vasa vasorum. B) plexus. C) precapillary sphincter. D) thoroughfare channel. E) venule.

C

11. In large arteries, the thick layer of elastic fibers is called the A) tunica intima. B) external elastic membrane. C) tunica media. D) internal elastic membrane. E) tunica externa.

D

2. Compared to arteries, veins A) are more elastic. B) have more smooth muscle in their tunica media. C) have a pleated endothelium. D) have thinner walls. E) hold their shape better when cut.

D