Multiple choice

In females the placenta originates from

  1. decidua

  2. myoblast cells

  3. stromal cells

  4. inner cell mass of the blastocyst

  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.