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BIlD 2-Reproduction 2

BIlD 2-Reproduction 2 - Fertilization A Control of...

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Reproduction II Ovarian Cycle LH and FSH increase GnRH= Increase in FSH= Increase in folicle cell development = increase in estrogen release Neg feedback on ant pit cells--> decrease in FSH Build up of GnRH--> surge of LJ and FSH Build up of uterine lining ( prepare for zygote) B. Estrogen/Progesterone LH surge--> triggers ovulation--> release of egg --> converts ruptured folicle into corpus luteum which secretes estrogen and progesterone Progesterone 1)Prepares uterine lining for implantation by embryo and have feedback control which inhibit LH and FSH release to prevent additional folicles from developing If no fertilization: Corpus luteum dgenerates --> decrease progesterone conc.--> 1) uterine lining sloughs off(flow period) 2) LH and FSH increae C. Fertilization Period 1. oocyte viability: 1-2 days 2. Sperm " " Fig 46.13 II. Hormone Reguation
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Unformatted text preview: Fertilization A. Control of Pregnancy placenta regenerate--> :human chorionic gonadotropin (HCG)--> acts on CL B> Parturition-- (birth) Hormone initiation: Fenal adrenal Cortex--(estrogen precursor)--> placenta--(estrogen relase)--> placenta--> prostoglandin production Events: 1) increase prostoglandins 2) decrease progesterone/estrogen--> no longer inhibit contration of uterine walls 3) oxytocin increase contraction 4) increase relaxin release---> makes birht canal larger, softens and dialates cerix, loosens pelvic bones Development I I. Fertilization A. Sperm structure B. Egg: surface elements--> jelly coat Fig 46.12 Fig 47.3 Acrosoal Rxn 1. sperm contracts jelly coat--> exocytoses of acrosoe enzymes--> puncture jelly coat 2) acrosomal process binds to vitelline layer: bindin receptros bind bindin...
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