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1926 Unknown

Which of the following statements is true of cardiac development?

ADuring formation of the heart loop, a single-tube heart remains suspended by a complete dorsal mesocardium
BThe atria are represented by cranial portions of endocardial tubes
CThe heart bends into an S-shape because the caudal regions of the endocardial tubes grow faster than the cranial regions
DThe left and right sides of the heart result directly from the side-by-side apposition
Unknown
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