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Unformatted text preview: of oxytocin and prostaglandins , which are stimulated by uterine contractions, which stimulate more hormones that cause more contractions. ...etc. First Stage The first stage of birth lasts from beginning of contractions to the full (10 cm) dilation of the cervix . Membranes of the amniotic fluid rupture, lubricating the vagina. Second Stage Strong uterine contractions of a minute in duration separated by two to three minute intervals propel the fetus down the birth canal. Abdominal muscles relax in synchrony with the uterine contractions. Third Stage After delivery of the baby, the umbilical cord is clipped and cut. The placenta (or afterbirth) in expelled through the vagina....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10