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Fetal development first trimester fertilized egg

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FETAL DEVELOPMENTFirst trimesterFertilized egg divides, multiples to 32–128 cells, &travels to the uterus where it is called a blastocystOn about the sixth or seventh day, it attaches to the uterine wallEnd of 2ndweek: blastocyst becomes an embryo & cellsdifferentiate into three layersChorionic villi form the placenta (brings oxygen and nutrients andremoves waste products)All major body structures are formed between 2-9 weeksFetus is about an inch long and weighs an ounce
FETAL DEVELOPMENTFirst trimester
FIGURE 5.4A CHRONOLOGY OF MILESTONES IN PRENATAL DEVELOPMENTJump to long image descriptionFetal Development2ndTrimester
FETAL DEVELOPMENTSecond trimesterFetus grows to about 14 inches and 1.5 poundsFetus requires large amounts of food, oxygen,and waterMother begins to feel fetal movementThird trimesterFetus gains most of its birth weightBrown fat develops to insulate and supply foodRespiratory and digestive organs develop morefullyMother’s blood brings immunity to the fetus
FIGURE 5.4A CHRONOLOGY OF MILESTONES IN PRENATAL DEVELOPMENTJump to long image descriptionFetal Development3rdTrimester
DIAGNOSING FETALABNORMALITIESAbout 3% of babies are born with a majorbirth defectNoninvasive screeningtestsQuadruple marker screen (QMS)Maternal blood test performed at 16 to 19 weeksEstimates the probability of fetal abnormalitiesCell free DNAPerformed after 10 weeksUsed to identify chromosomal disorders
DIAGNOSING FETALABNORMALITIES(2)Invasive diagnostictestsCarry a slight risk of miscarriage (0.3–0.7%)Chorionic villus sampling (CVS)Performed at 10 to 12 weeksRemoval of a tiny section of chorionic villiAmniocentesisFluid removal from around developing fetusUsually takes place at 16 to 22 weeksUltrasonography (ultrasound)High frequency sound waves used to create asonogram
FETAL PROGRAMMINGFocuses on how conditions in the womb mayinfluence the risk of adult diseasesLow birth weight linked to increased risk of heartdisease, high blood pressure, obesity, diabetes,and schizophreniaHigh birth weight in female infants associated withincreased risk of hypertension, diabetes, and somecancers in later lifeAdequate nutrition and stress management arevital for mother and fetus
THE IMPORTANCE OF PRENATAL CARERegular medical checkupsBlood testsRh factorPrenatal nutritionAvoiding drugs and other environmentalhazardsTeratogens—congenital malformationsAlcohol—fetal alcohol syndrome (FAS)Tobacco, caffeine, drugsSTI’s and other infections
THE IMPORTANCE OF PRENATAL CAREPrenatal activity and exerciseKegel exercisesPrenatal exercise classesPreparing for birthChildbirth classesInvolvement of father or partner
COMPLICATIONS OF PREGNANCYAND PREGNANCY LOSSComplications arise for many different reasons:Maternal diseases and exposuresPlacental factorsFetal conditionsComplications:

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Term
Fall
Professor
NoProfessor
Tags
Sexual intercourse, Fertility, Infertility

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