Veins A carry blood away from the heart B carry blood under very high pressure

Veins a carry blood away from the heart b carry blood

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31. Veins A. carry blood away from the heart. B. carry blood under very high pressure. C. may contain valves and are lined with endothelium. D. are described as strong, rigid vessels that always carry oxygenated blood. E. have thick, many layered walls. 32. The structure of a capillary wall differs from that of a vein or artery because 33. The vasa vasorum 34. Which type of veins connect two primary capillary networks?
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35. Sympathetic nerve fibers that innervate blood vessel walls are found primarily in the A. tunica intima. B. tunica media. C. tunica adventitia. D. tunica externa. E. tunica interna. 36. Arteriosclerosis is characterized by 37. Atherosclerosis is the 38. In the pulmonary circulation, the _____ carry blood to the lungs. 39. Systemic circulation A. carries blood from the right ventricle to the lungs. B. includes all arteries but the veins are part of the pulmonary circulation pathway. C. includes the aorta and all of its branches. D. ends in capillaries of the toes. E. includes blood flow to the body, but not the brain.40. The first blood vessels that branch from the ascending aorta are the 41. Which of the following arteries branches directly from the aortic arch?
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