Answer
The heart is completely partitioned by the end of the fifth week of gestation.
Work Step by Step
During the period of weeks 5-9 of gestation, important changes take place in the development of the heart:
1. The ventricular region is partitioned into left and right ventricles. by formation of the
interventricular septum.
2. The atrial region is partitioned.
3. Atrioventricular valves are formed
4. Semilunar valves are formed
