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Reproductive System Shanna Greenberg
The three stages of labor and delivery are the  dilation stage , the  expulsion stage , and the  placental stage . Dilation Stage During this first stage of labor, the uterus contracts, pushing the fetus onto the cervix, causing the cervix to thin (efface) and dilate (open).  A woman in labor remains in the dilation stage until her cervix is 100% effaced and she is dilated to 10 cm.
The three stages of labor and delivery are the  dilation stage , the  expulsion stage , and the  placental stage . Explusion Stage Once her cervix is fully dilated, a laboring woman enters the expulsion stage.  She actively pushes to help expel the baby.  The head normally appears (crowns) first, but in some cases the baby can be butt first (frank breech).  This stage ends when the baby has fully emerged (delivered).
The three stages of labor and delivery are the  dilation stage , the  expulsion stage , and the  placental stage . Placental Stage This is the final stage of labor and delivery.  Contractions of the uterus continue until the placenta is delivered, ending labor and delivery.
The time required for the development of a fetus is called  gestation. Gestation varies by species of animal.  Normal human gestation is 40 weeks, which is actually 10 months or 9 full months.  Pre-term birth is any birth before 37 weeks gestation.  Generally births before 23 weeks gestation are not considered viable  viability refers to the point in gestation at which a fetus could survive outside the womb.
The cessation of menstruation is called  menopause . Menopause is the end of a womans childbearing years.  The ovaries hormone production significantly decreases, resulting in various physical symptoms, most importantly, the lack of a menstrual period.  Menopause is officially declared after amenorrhea has lasted for one full year.  This usually occurs sometime between ages 40 to 55.

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Chapter 10

  • 2. The three stages of labor and delivery are the dilation stage , the expulsion stage , and the placental stage . Dilation Stage During this first stage of labor, the uterus contracts, pushing the fetus onto the cervix, causing the cervix to thin (efface) and dilate (open). A woman in labor remains in the dilation stage until her cervix is 100% effaced and she is dilated to 10 cm.
  • 3. The three stages of labor and delivery are the dilation stage , the expulsion stage , and the placental stage . Explusion Stage Once her cervix is fully dilated, a laboring woman enters the expulsion stage. She actively pushes to help expel the baby. The head normally appears (crowns) first, but in some cases the baby can be butt first (frank breech). This stage ends when the baby has fully emerged (delivered).
  • 4. The three stages of labor and delivery are the dilation stage , the expulsion stage , and the placental stage . Placental Stage This is the final stage of labor and delivery. Contractions of the uterus continue until the placenta is delivered, ending labor and delivery.
  • 5. The time required for the development of a fetus is called gestation. Gestation varies by species of animal. Normal human gestation is 40 weeks, which is actually 10 months or 9 full months. Pre-term birth is any birth before 37 weeks gestation. Generally births before 23 weeks gestation are not considered viable viability refers to the point in gestation at which a fetus could survive outside the womb.
  • 6. The cessation of menstruation is called menopause . Menopause is the end of a womans childbearing years. The ovaries hormone production significantly decreases, resulting in various physical symptoms, most importantly, the lack of a menstrual period. Menopause is officially declared after amenorrhea has lasted for one full year. This usually occurs sometime between ages 40 to 55.