Question

Progesterone is made during the third trimester by the: a. placenta b. endometrial lining c. chorion d. corpus luteum

Short answer

The correct option is a. placenta

Step-by-step solution

Step 1. Given information

As the trimester progresses, the outer layer of the embryo begins to merge with the endometrium, and the placenta forms. This organ takes over the nutrient and waste requirements of the embryo and fetus, with the mother’s blood passing nutrients to the placenta and removing waste from it .

Step 2. Explanation

The correct option is a. placenta

The placenta has taken over the functions of nutrition and waste and the production of estrogen and progesterone from the corpus luteum, which has degenerated. The placenta will continue functioning up through the delivery of the baby