system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Luteal phase dominant hormone
assistant
The correct answer is  Luteal phase is the third phase of the human menstrual cycle when the ovarian follicle that has recently discharged an ovum ruptures and transforms into the corpus luteum, which secretes progesterone. Progesterone acts on the endometrium to build up tissue with a supply of blood for nourishment of the potential embryo. If feilization and conception do not take place, the estrogen level falls and the menstrual phase begins.Ref: Ganong&;s review of medical physiology;24th edition; page no:-403