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Prenatal Development

Prenatal Development - CHAD 60 23 Sept 09 PRENATAL...

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CHAD 60 23 Sept 09 PRENATAL DEVELOPMENT & BIRTH INTRO Gestation from last menstrual period= about 40 weeks from conception= about 38 weeks 1st two weeks: conception one egg/ovum & one sperm cell must meet in fallopian tube, then fertilized egg contin- ues into uterus egg must be “ripened” and sperm must be viable on average, egg is only ready for about a 48hr window 2 types of sperm, x chromosome carrier or y chromosome carrier determines gender of baby y chromosome sperm cells have extra sugar, so are “sprinters” (24 hrs,  maybe  48) x chromosome sperm cells are slower, “marathon runners” (about 96 hrs) timing of intro of egg & sperm best predictor of gender sperm come close to beginning of “ripe” egg= boy sperm come before beginning of “ripe” egg= girl if fertilized egg doesn’t make it into uterus, called ectopic pregnancy around 30% of pregnancies don’t take Contraception Reversible ways get rid of the egg birth control pills prevent release of egg get rid of the sperm spermicide kills sperm get rid of the meeting condoms, diaphragm, any barriers get rid of the pregnancy IUD- Intrauterine device, creates inhospitable environment for implanting of fertil- ized egg morning after pill Relatively irreversible ways vasectomy tube tying Symptoms of Pregnancy 4 weeks: ligaments which support uterus slightly stretched with new weight of embryo,  can feel kind of like cramps, but not really
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CHAD 60 23 Sept 09 4-8 weeks: pregnancy makes organs with mucous membranes sensitive, can create  morning sickness or stuffy nose very sleepy
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