Primary function of progesterone during pregnancy

Hello! Let's examine this biology question about the role of hormones in the human reproductive system. The question asks, what is the primary function of progesterone during pregnancy?

To answer this, let's look at the four options provided and evaluate each based on endocrine functions.

First, let's identify the hormones responsible for the other functions to rule them out. Follicle development is primarily promoted by Follicle Stimulating Hormone, or FSH, which is released from the anterior pituitary.

The stimulation of ovulation is triggered by a sudden surge in Luteinizing Hormone, or LH. So, we can rule out the first two options.

While progesterone has various effects on mucus, its role in increasing thin cervical mucus is more associated with high estrogen levels before ovulation to aid sperm travel.