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Chapter 5

Chapter 5 . Prenatal Development . I.Prenatal Development . Development of baby during period before birth This is one of the most amazing concepts/gifts God has given us here on Earth

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Chapter 5

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  1. Chapter 5 Prenatal Development

  2. I.PrenatalDevelopment Development of baby during period before birth This is one of the most amazing concepts/gifts God has given us here on Earth It is absolutely astounding how people look at the human body and prenatal development; They look it straight in the face and deny that there is a God who created it all, but instead claim in happens by accident!! People look at a cardboard box and assume someone created it, but look at a human being and think it happened by chance.

  3. II. Conception • A. Fertile period • b/w 11th & 18th day of cycle • B. Ovulation • Take place approx. 14th day • 1. once each month, an ovum (female cell or egg) is released by one of the ovaries • 2. if egg meets a sperm & is then fertilized in the Fallopian tube, conception takes place • Conception – union of ovum & sperm, resulting in pregnancy • This union is called a zygote (fertilized egg) • Zygote – 1st cell of life

  4. 3. If egg is not fertilized, it moves through the fallopian tube to uterus • Uterus - organ where baby develops - - when egg reaches uterus, it’s usually flushed away with menstruation bc it is no longer able to be used

  5. III. Period of Zygote – 1st cell of life • A. lasts approx. 2 weeks • B. attaches itself to lining of uterus & begins to grow – 5 days to fully attach • C. lining is needed to nourish the zygote so the lining doesn’t shed itself = NO menstruation • 1st sign of pregnancy is missed period • D. it grows by process called cell division • E. remarkable growth takes place, yet by end of 2 weeks, it’s still only the size of a pinhead

  6. IV. Period of Embryo 2nd stage – developing cluster of cells in uterus during about 3rd-8th week of pregnancy A. embryo becomes firmly attached to inner lining of uterus B. by end of this stage, the placenta, which is the tissue that connects the sacs around the unborn baby to the mother’s uterus, develops

  7. C. umbilical cord, long tube that connects the placenta to the unborn baby, is also developing • D. nourishment & O2 from mom’s bloodstream carried from placenta to baby through umbilical cord • E. soon embryo surrounded by bag of liquid called amniotic fluid (surrounds & protects baby during pregnancy) • Actions as a cushion through minor bumps or falls

  8. V. Period of Fetus • Begins at 8 weeks and lasts until birth • By beginning of this period, beginnings of all organs and body parts • arms legs, facial features, internal organs, but not ready to function yet • 4, 5th month 1. kicks, movements, touch wall of uterus called “quickening”

  9. C. Heartbeat usually heard before movement felt D. Baby grows, volume of fluid increases E. Just before delivery, fluid decreases as baby becomes more active F. By 7thmonth most fetal dev. has taken place G. Remaining months, major organs become ready to function without help of mom’s body, baby gains weight, also stores nutrients and builds immunity to diseases and infections H. Lightening- baby drops into birth canal 1.) 1st baby- this takes place days or weeks before delivery 2.) 2nd,3rd, etc.- this may happen just before labor

  10. Baby nestled in pelvis, muscles of uterus and abdomen stretched 1.) can be stretched up to 60 times their orig. size and return to orig. size within a month after delivery J. 40 weeks- Baby ready to be born! K. After birth, placenta must be delivered

  11. Section 2- A closer look at conception • Genetics Package- -- passing on of character from previous generation- physical build, skin color, hair texture and color, color of eyes, size of ears, hands, feet, blood type, some medical conditions

  12. A. At conception, every baby receives 46 chromosomes (tiny particles in nucleus of every cell that carry hereditary char.) 1.) 23 from father’s sperm; 23 from mother’s ovum 2.) each contains thousands of genes that determine inherited char.

  13. 3.) For every char., an individual receives 2 copies of a gene – one from mom, 1 from dad ex. Both blue eyes -> child most likely to have blue eyes or one brown and one blue eye -> brown eye gene is the dominant factor (stronger); blue eye gene is recessive (weaker) 4.) fertilized egg is less than ½ the size of pin head – has its own genetic blueprint – AMAZING!!

  14. B.Sex determination – at moment of conception • 1. determined by special chromosome – X & Y • Each ovum gives —X chrom; • Each sperm gives—X or Y • XX=girl, XY=boy • Male determines sex of child

  15. II. Multiple Births • A. fertilized egg divides into 2 cells & continues to divide into millions of cells • B. Sometimes growing mass of cells splits apart soon after fert. & the 2 clumps of cells continue to divide & grow into separate embryo • 1. each half forms embryo – identical twins • 2 babies from same egg & sperm • One placenta, 2 umbilical cords • Same sex, similar characteristics

  16. C. Fraternal twins– one egg may be released from each ovary at the same time • 1. Each egg is fertilized by a diff. sperm • 2. 2 placentas • 3. each diff chromosomes

  17. D. multiple births – can combination of fraternal & identical • 3 eggs, 3 sperm – all fraternal • Combo

  18. III. Infertility • Inability to conceive children – 1/6 • A. usually fertility analysis after 1 yr • B. sometimes surgery or medication may help • Meds to stimulate ovary releasing • Possible multiple births • Side effects – lung problems, nausea, abdominal pain

  19. C. Sometimes male accounts for inability to conceive – low sperm count etc. • D. Good news- today half of those couples who would otherwise not be able to conceive can with med. Help • E. Medical and counseling support is needed by these couples

  20. F. options for infertile couples • 1. adoption – one of the best gifts • 2. artificial insemination- • injecting father’s sperm into woman’s uterus with spec. needle (sometimes donor sperm which leads to ethical ?’s) • a.) a damaged fallopian tube = $5,000 for AI • 3. in vitro fertilization – • surg. Remove egg from ovary which is placed in small glass with spec. solution and sperm added • a.) if fert. Takes place, zygote inserted in woman’s uterus • b.) if it attaches itself to lining of uterus – normal preg.

  21. 4.)”Gift” – donor sperm is inserted in Fall. Tube • a.) woman immobile for 3 days so zygote can travel to uterus • b.)more natural means - $8,000 • 5.) Ovum Transfer- “adoptive preg.” • a.) egg from donor – in vitro fert. With sperm and then implanted in uterus • 6.) surrogate mother- “substitute” • A.) a woman carries and delivers a baby for a couple • ALL are controversial- Is this what God intended for procreation????

  22. 5-3 Prob. In Prenatal Dev. • I. Birth Defects- an abnormality presents at birth that affects the structure • 1. premature babies- born before dev. is complete • A.) less then 36 wks., weighs less then 5 ½ lbs. • B.) low weight babies- born at full term, but less than 5 ½ lbs. • C.) need special care • 2. some defects affect shape or size of body or certain parts- ex.- missing finger a.) physical birth defect

  23. 3.Others affect a part that doesn’t function properly – ex. Blindness, deafness a.) functional birth defect 4.Not all are apparent at birth, vary in severity; some can be corrected 5. Prenatal dev. Not proceeding normally often results in: a. miscarriage -natural ending of preg. Before embryo or fetus could possible survive b. still birth – natural ending of preg. After 20 weeks c. grievous processes

  24. Birth Defect Project • Create a PP on one of the following birth defects found on page 135 in your text book: • Cerebral palsy • Cleft lip/palate • Cystic fibrosis • Down syndrome • Muscular dystrophy • PKU • Sickle-Cell Anemia • Spina Bifida • Tay-Sachs

  25. Project must include: PP Cause Prevention Treatment What the defect does to body Who usually gets it Pictures

  26. B. Causes • 1. Hereditary disease/defect passed down – cleft palate • 1. environmental • a.) nutrient balance of mother’s diet • b.) diseases, infections of mom during pregnancy

  27. I. Avoiding Environmental Hazards • A. Alcohol – abstain from all alcohol, its not worth the risk • FAS • Wide bridge nose • Don’t like change • Slow developing

  28. B. Drugs • Sudafed, tylenol, tums OK • Prescription OTC drugs • No aspirin, cold med, antihistamine, especially through 3rd month • Caffeine • Tobacco – low birth weight • Illegal drugs – “street drugs” • Dev. Slow • Born with addiction

  29. C. X-rays – may be harmful to unborn fetus • STD’s • AIDS – attacks immune system • Many others will cause birth defects or even death

  30. Fetal testing • Ultra sound • Uses sound waves to make a video image of an unborn baby • Skeletal or organ defects • Due date

  31. B. Amniocentesis • Process of withdrawing a sample of the amniotic fluid surrounding unborn baby with a special needle • Test for Down Syndrome • Risk of miscarriage

  32. C. Chorionic villi sampling 1. sampling small amounts of the tissue from the membrane that encases the fetus and the placenta 2. go through the vagina to uterus 3. villi are snipped 4. tests same as amnio, but can be done earlier in pregnancy 5. more than 100 birth defects can be detected prenatally

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