Which of the following statements concerning the embryonic cardiovascular system is true?
A. The heart develops from four endothelial tubes.
B. The bulbus cordis becomes the sinoatrial node (the adult pacemaker).
C. Blood vessels form from blood islands.
D. An opening in the interatrial septum is called the sinus venosus.
E. There is an opening in the interventricular septum.
Answer: C
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