Figure 2.
Diagram showing development of the ovary and uterus, hormone levels (estradiol and progesterone), and key events (menstruation, ovulation, and decidualization) during the 28—day human menstrual cycle.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.