How do lymphatic vessels differ from those of either the arterial or the venous system?
A) They have thicker walls than veins, but less thick than those of the arteries.
B) They do not run together with either the arteries or the veins.
C) They have very few significant differences.
D) They have fewer valves than do the veins.
E) The lymphatic valves are spaced close enough to give the vessel the appearance of a string of beads.
E) The lymphatic valves are spaced close enough to give the vessel the appearance of a string of beads.
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