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:
a. sinoatrial node b. Purkinje fibers c. bundle of His d. atrioventricular bundle
Hormones can beA) peptides.B) fatty acids.C) steroids.D) amines.E) phospholipids.
What will be an ideal response?
The hard, dense bone that forms the outer surface of bones is:
A) compact bone. B) cancellous bone. C) spongy bone. D) articular cartilage.
A concentric contraction is described as
A. a muscle produces increasing tension as it shortens. B. action potential frequency is high enough that no relaxation of muscle fibers occurs. C. a muscle produces constant tension during contraction. D. a muscle produces tension, but the length of the muscle is increasing. E. a muscle produces an increasing tension during contraction.