Which of the following statements concerning the embryonic cardiovascular system is true?

A) The heart develops from four endothelial tubes.
B) Blood vessels form from blood islands.
C) An opening in the interatrial septum is called the sinus venosus.
D) The bulbus cordis becomes the sinoatrial node (the adult pacemaker) .
E) There is an opening in the interventricular septum.

Question

Beatriz Valdespin · Accepted Answer

Final Answer : B, Explanation :  Blood vessels form from blood islands, which are clusters of angioblastic (precursor to blood vessels) cells that differentiate into endothelial cells to form the lining of blood vessels.

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