Multiple choice

Which of the following develops into the placenta?

  1. Umbilical cord

  2. Inner cell mass of the blastocyst

  3. Decidua

  4. Myoblast cells

  5. Trophectoderm

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The developing embryo has two main populations of cells: an inner cell mass and a trophectoderm. The trophectoderm cells lie at the outer surface of the developing embryo and will become the placenta.