________ A cardiac defect in the area of the oval fossa
A)A
B)B
C)C
D)D

Question

________ A cardiac defect in the area of the oval fossa
A)A 
B)B 
C)C 
D)D

Quizplus · Accepted Answer

Atrial septal defect (ASD)is a common congenital anomaly.It occurs more frequently in females than in males.A patent oval foramen is the most common form of ASD,resulting from incomplete fusion between the septum secundum and the flap-type valve of the oval foramen.Before birth,most of the blood entering the right atrium is shunted through the oval foramen into the left atrium.After birth,the pressure in the left atrium rises with the return of blood from the lungs.As a result,the septum primum becomes pressed against the septum secundum,and eventually the oval foramen is permanently closed.Of the main types of ASD,the secundum ASD is most common and is located in the area of the oval fossa.

________ a Cardiac Defect in the Area of the Oval