Pregnancy and Childbirth
Pregnancy and Childbirth PSYC 3070
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This 3 page Class Notes was uploaded by Michelle Notetaker on Friday October 9, 2015. The Class Notes belongs to PSYC 3070 at Bowling Green State University taught by Pat Nebl in Summer 2015. Since its upload, it has received 40 views. For similar materials see Human Sexuality in Psychlogy at Bowling Green State University.
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Date Created: 10/09/15
Pregnancy and Childbirth Graafian follicle breaks open and releases ovum where it enters the Fallopian tubes Takes 37 days to travel down the uterus but ovum can only be fertilized during the rst 24 hours it leaves the ovary 200400 million perm released during ejaculation Only a few thousand reach fallopian tube and fewer than 50 reach the egg sperm can live 35 days in the reproductive tact if sperm doesn t penetrate ovum it becomes overly 39ripe and disintegrates in the uterus Membrane allows sperm to pass upon one sperm passing the membrane almost instantaneously changes to prevent more sperm within 2430 hours nuclei have fused to form a zygote cell division begins but size does not increase bastocyst about 100 cells reaches uterus 811 days after ovulation blastocyst attaches to endometrium caled an embryo after implantation and fetus at about 8 weeks umbiica cord and placenta will serve a mother HCG secreted by placenta prevents corpus luteum from degrading and continues to produce progesterone for the endometrium HCG preganacu test most accurate 2 weeks or more after missed pedod 5090 experience nausea week 68 to week 20 Ectoderm form nervous system skin and teeth Mesoderm forms muscles skeleton and blood vessels endoderm forms internal organs 3rd week neural tube forms 4th week umbilical cord heart and digestive system being to form 8th week heart is pumping and all organs are developing In 10 of pregnancies amniotic sac breaks prior to labor quotwater breaksquot uterine contractions push fetus toward cervix become longer and closer together every 1020 min to ever 12 minutes cervix dilates mucous plug comes out crowning as head is delivered rst further contractions and vaginal expansion pacenta detaches from uterus and leaves body called after birth Horizontal incision through abdomen and uterus Many necessary situations materna illness breech birth etc However cesarean births are associated with a higher rate of postdelivery complications Lactation begins about 3 days after childbirth Proactin causes milk production and oxytocin causes milk letdown World Health Organization recommends infants be exclusively breastfed for 6 months Milk contains proteins which ght infection in addition to nutrients breastfed babies have higher le as adults Mortensen et al 2002 Benefits for mother as well 15 of women experience PostPartum Depression 1 of women experience PostPartum Psychosis Stress hormones and endorphin levels rise through pregnancy and then fall after birth Average sperm count per ejaculate has dropped more than half in part 50 years Endocrine problems Drugs Radiation lnfections Many pollutants resemble estrogen Bisphenol A etc and act on estrogen receptor sites Structural problems of fallopian tube or uterus Malformations endometriosis infections and scar tissue Faiure to release egg Often endocrine problems