The superior mesenteric artery:
A) arises from the aorta at the T10 level.
B) is accompanied by the superior mesenteric vein on its right.
C) gives rise to a series of arterial arcades called vasa recta.
D) passes posterior to the horizontal part of the duodenum.
E) is accompanied by sympathetic fibers derived from lumbar splanchnic nerves.
Ans: B
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The “pacemaker” for the heart is usually the:
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The hard, dense bone that forms the outer surface of bones is:
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