Amniocentesis and subsequent genetic analysis of a developing fetus indicates that it’s genotype is XX. However, ultrasound indicates that the fetus is developing as a normal male (including all internal and external structures). The most likely explanation for this phenomenon is that
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The associated drawing is a hypothetical view of the aortic…
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), wh…
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…
The septum intermedium of the heart is formed by the fusion of which combination of endocardial cushions?
Which of the following statements regarding fetal circulatio…
Which of the following statements regarding fetal circulation is correct?
A newborn with double superior vena cava typically
A newborn with double superior vena cava typically
On an EKG, atrial depolarization is represented by:
On an EKG, atrial depolarization is represented by:
This great vessel transports blood from the left ventricle o…
This great vessel transports blood from the left ventricle out to the body:
These vessels have a thick tunica externa, a large lumen, an…
These vessels have a thick tunica externa, a large lumen, and may contain valves:
This type of pressure draws substances INTO a vessel:
This type of pressure draws substances INTO a vessel: