Featured Microscopist: Loes Modderman

Progesterone

Progesterone

Progesterone is a steroidal hormone that plays a central role in the female reproductive cycle. The sex hormone is produced primarily by the adrenal glands, the placenta, and the corpus luteum of the ovary. In the absence of oocyte fertilization, progesterone levels decrease, and menstruation occurs. However, if the egg should happen to become fertilized, progesterone levels will increase to help maintain pregnancy and promote mammary gland development.

Photomicrographs are © 2000-2022 by Loes Modderman.
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