★ Vessels Quiz
Which of the following is true regarding veins?
A. Veins have valves; arteries do not
B. Veins carry blood away from the heart, while arteries carry blood to the heart.
C. Veins have smaller-diameter lumens compared to arteries.
D. Veins are more muscular than arteries.
Preview next quiz:
Which layer of the typical vessel can be regulated to constrict or dilate the lumen?
A. vasa vasorum
B. tunica media
C. tunica externa
D. tunica intima
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