Popeâs Homily at Vespers on Eve of New Year âHoly Mother Church teaches us to end the year and also our days with an examination of conscience â¦ to be grateful and to ask for forgivenessâ December 31, 2014 ZENIT Staff Francis
Progesterone causes the endometrial glands to secrete, preparing the endometrium for blastocyst implantation. If the oocyte is fertilized, the corpus luteum enlarges to form a corpus luteum of pregnancy and increases hormone production. With pregnancy, chorionic gonadotropin, secreted by the trophoblast of the chorion, prevents degeneration of the corpus luteum.
The secretions of the corpus luteum, estrogen and progesterone prepare the uterus for the possible nidation of a fertilized egg. The corpus luteum is formed from the collapsed ovarian follicle, the ingrowth of capillaries and fibroblasts from the theca cell layer and luteinization of the granulosa cells.rogesterone. Progesterone is produced by luteinized granulosa cells. Large quantities are synthesized by the corpus luteum following ovulation. Progesterone concentrations rise to a peak 7â8 days following ovulation and fall rapidly with the failure of the corpus luteum (Fig. 2).