Select your answer:
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Vessels › ViewWhich 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.
Blood Formation and Clotting › View
What is the name of the common stem cell from which all blood cells are derived?
A. megakaryocytes
B. hempocytoblast
C. lymphoid cells
D. myeloid cells