When does the metanephros become functional?: (A) At week 3 of development, (B) At week 4 of development, (C) At week 10 -12 of development, (D) Just before bih
Answer is C. The metanephros begins to form at week 5 and stas to function in the fetus at about week 10-12 The pronephros is not functional in humans. The mesonephros leaves behind mesonephric duct & gets degenerated.