Unknown

Which of the following statements is true of cardiac development?

During formation of the heart loop, a single-tube heart remains suspended by a complete dorsal mesocardium

The atria are represented by cranial portions of endocardial tubes

The heart bends into an S-shape because the caudal regions of the endocardial tubes grow faster than the cranial regions

The left and right sides of the heart result directly from the side-by-side apposition