The hea assumes its normal four chambered shape by the end of:-: (A) 4 weeks, (B) 6 weeks, (C) 8 weeks, (D) 12 weeks
Answer is B. - The hea assumes its normal four chambered shape by the end of 6 weeks of intrauterine life. - From then, only minor changes occur & consist mainly on growth of the hea as a whole with increasing age of fetus.