The associated drawing is a hypothetical view of the aortic arches before they are remodeled.  Which letter corresponds to the vessel that normally regresses, but is retained to give rise to a double aortic arch?

During folding of the heart tube (not embryonic folding), which of the following directions does the primitive (primordial) atrium move?

The septum intermedium of the heart is formed by the fusion of which combination of endocardial cushions?

Which of the following statements regarding fetal circulation is correct?

A newborn with double superior vena cava typically

This great vessel transports blood from the left ventricle out to the body:

On an EKG, atrial depolarization is represented by:

These vessels have a thick tunica externa, a large lumen, and may contain valves:

This type of pressure draws substances INTO a vessel:

What is the term for the measurement of the amount of blood that gets transported to the tissue over time?