Outside of the secretory (part of luteal) phase or pregnancy, progesterone amounts in the body are existent (due to the adrenal glands), but negligible. Progesterone is produced by the corpus luteum, which is a temporary organ whose function is to signal to the pituitary gland to momentarily prevent menstruation, for purposes of maintaining fertilization or pregnancy. The pituitary gland releases prolactin, which signals the corpus luteum (and if during pregnancy, the placenta) to release more progesterone, creating a feedback loop. If the egg is not fertilized, the corpus luteum dies within the ovaries, then this signals for the pituitary to release Follicle Stimulating Hormone (FSH) instead of prolactin, allowing the menstrual cycle to proceed. Luteinizing Hormone (LH) is released later to continue the egg’s preparation. The ovaries also produce estrogens and progesterones during the luteal phase and pregnancy. Progesterone increases prolactin, and prolactin lowers FSH and LH.
Estrogens are formed from androgens through a process called aromatase, and this happens within ovary, egg, bone, brain and adipose tissue
This is an excerpt. Read breast-endocrinology.pdf or super-bazongas.pdf for more.
- Nussey S, Whitehead S. Endocrinology: An Integrated Approach. Oxford: BIOS Scientific. 2001. https://www.ncbi.nlm.nih.gov/books/NBK22/.
- Stocco C. Tissue Physiology and Pathology of Aromatase. Steroids 77.1 -2 (2012): 27-35. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3286233/.
- Progesterone. Encyclopædia Britannica, 2012. .
- Super Bazongas. https://breast.is/ebook/super-bazongas.pdf.