Now progesterone is initially produced by the corpus lutein that is found in the ovaries. Now eventually the corpus lutein begins to break down, it begins to degenerate and what happens is our placenta takes over the role of producing our progesterone. So initially it's the corpus luteum that produces our progesterone, but eventually our placenta takes over that job because the corpus luteum degenerates, it breaks down. Now there are two important functions of progesterone. First it is basically used to actually maintain that endometrium layer inside the uterus. And the second role is to basically inhibit the contraction of our smooth muscle in the uterus to basically prevent premature labor.