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class notes 5.3 - Biology 1006 Uterine contractions o...

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Biology 1006: 5/3/2010 Uterine contractions: o Progesterone- maintains pregnancy, and inhibits contractions of the smooth muscles of the uterus o Estrogen- accentuates uterine contractions PMS: pre-menstrual syndrome o Decreasing levels of estrogen and progesterone prior to menstruation o Cramping- contraction of smooth muscles of the uterus o Fluid retention o Mood changes Birth control pills are mostly progesterone o Shuts down the pituitary gland so there is no fertility HCG: human Chorionic Gonadotropin o Hormone released by the fetus in very small quantities, shuts down FSH and LH so there is no more cycles or menstruation o The “missed period” in pregnancy Estrogen is responsible for the transfer of calcium from the mother to the fetus o Increases weight gain and deposition of fat to make sure there is enough energy for the fetus during the time of development Hormones from the fetus begin to increase and start the labor contractions o Oxytocin is responsible for smooth muscle contractions during time of delivery, causes the start of delivery
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