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Hormonal Regulation in Menstrual Cycle
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Oxytocin
Induces the contraction of uterine muscles and milk ejection in breastfeeding, but also has subtle influences on the menstrual cycle and social behavior.
Androgens
Serve as precursors to estrogens, and maintain libido and the reproductive system.
Estrogen
Regulates the menstrual cycle, promotes the growth of the uterine lining, and affects numerous body systems.
Follicular phase
The phase of the menstrual cycle during which follicles in the ovary mature, ending with ovulation.
Menstrual phase
The phase of the menstrual cycle where the uterine lining sheds, resulting in menstrual bleeding.
Luteinizing hormone (LH)
Triggers ovulation and development of the corpus luteum.
Follicle-stimulating hormone (FSH)
Stimulates the growth of ovarian follicles in the ovary before the release of an egg from one follicle at ovulation.
Prolactin
While mainly involved in milk production, excessive amounts can suppress reproductive function.
Human Chorionic Gonadotropin (hCG)
Supports the corpus luteum, thereby maintaining progesterone production critical for pregnancy in the first trimester.
Ovulation
The release of a mature egg from the surface of the ovary. This event is central in the menstrual cycle.
Luteal phase
The second phase of the menstrual cycle, when the body prepares for a possible pregnancy.
Progesterone
Stabilizes the uterine lining for possible pregnancy post-ovulation and regulates the menstrual cycle.
Gonadotropin-releasing hormone (GnRH)
Stimulates the release of other hormones like FSH and LH from the anterior pituitary gland.
Inhibin
Inhibits the secretion of follicle-stimulating hormone (FSH) to regulate the menstrual cycle.
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