In comparing the volume of blood moved from atria to ventricles when the atria contract with the volume of blood ejected from the heart when the ventricles contract, we observe that .

A) atrial contractions move as much blood into the ventricles as ventricles eject
B) atrial contractions move more blood into the ventricles than ventricles eject
C) atrial contractions move less blood into the ventricles than ventricles eject