Which of the Following Is an Essential Structural Feature of Veins

question 77

Multiple Choice

Which of the following is an essential structural feature of veins for both the skeletal muscle pumping and respiratory pumping used to aid venous return of blood to the heart?

• A)thick muscular middle layer of vessel wall
• B)venous valves
• C)two layers of elastic connective tissue in vessel wall
• D)sympathetic innervation of smooth muscle in middle layer of vessel wall
• E)modified transitional endothelium lining lumen of vessel

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