PSYC 2740 Chapter Notes - Chapter 5: Margaret Mead, Phenylketonuria, Motor Coordination
21 Oct 2013
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Women had a 1 in 10 chance of dying from giving birth. 1/3 of women prefer birthing center over hospital. Parturition: the process of uterine, cervical, and other changes that brings on labor, begins about two weeks before delivery: corticotropin-releasing hormone (crh): a protein that determines the timing of parturition. During parturition, rising levels of estrogen stimulate uterus to contract and cervix to become more flexible. Contractions (mild tightening"s of the uterus) that expel the fetus begin 266 days after conception: false contractions aren"t frequent, rhythmic, and painful like real ones. Three overlapping stages of labor: 1) dialation of the cervix is the longest lasting 12-14 hours. Contractions 15-20 minutes apart then to 2-5 minutes apart till the cervix is 10 centimeters apart: 2) descent and emergence of the baby lasting up to an hour. Ends when the baby emerges completely out of the mother"s body.
