Hormones in Reproduction
- Created by: ssavage
- Created on: 01-03-16 19:06
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- Reproductive Hormones
- LH
- Lutenising hormone triggers the release of an oocyte from a follicle in women. In men, it binds to receptors on Leydig cells in testes to stimulate secretion of testosterone.
- FSH
- Follicle Stimulating Hormone stimulates the development of follicles in women by binding to them, and binds to Sertoli cells in mean making them more receptive to testosterone.
- Oestrogen
- During pregnancy, these hormones cause breast tissue to develop in readiness for lactation. Inhibits oxytocin until just before birth.
- Progesterone
- Released by mature follicles to inhibit LH and FSH, but then causes the LH surge and the release of an oocyte.
- During pregnancy, these hormones cause breast tissue to develop in readiness for lactation. Inhibits oxytocin until just before birth.
- Testosterone
- Affects Sertoli cells to trigger spermatogenesis, and acts to inhibit LH when levels are high.
- Progesterone
- HCG
- Human Chorionic Gonadotrophin stimulates the corpus luteum to release progesterone and oestrogen during pregnancy to maintain lining of the uterus and ensure implantation of a blastocyst
- HPL
- Human Placental Lactogen ensures breast tissue is receptive to oestrogen and progesterone. Also maintains maternal blood glucose levels.
- Oxytocin
- Coincides with falling levels of progesterone to stimulate contraction of uterine muscles during birth, and activates muscles surrounding milk glands during lactation.
- Prolactin
- Prolactin maintains milk production in breast tissue during lactation and prevents ovulation.
- GnRH
- Gonadotrophin releasing hormone is secretes by the hypothalamus and binds to receptors on the anterior pituitary gland to stimulate the synthesis and release on FSH and LH
- Inhibin
- Secreted by the granulosa cells in women and the Sertoli cells in men, inhibin acts to inhibit FSH as a form of negative feedback
- LH
- Male
- Female
- Both
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