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Chandan Narayan

ch3Student 1Which of the following does not occur during the course of prenatal developmentASystems and structures increase in size and complexityBStructures decrease in sizeCStructures gradually disappear a tail for exampleDStructures migrate to permanent locations2Where does fertilization usually occurAin an ovaryBin the uterusCin the vaginaDin a fallopian tube3Prenatal development is divided into three distinct but continuous periods In the correct developmental order following conception these periods areAovum zygote and fetusBzygote fetus and ovumCgerminal embryo and zygoteDzygote embryo and fetus4The period of the zygote in prenatal development endsAwhen the fertilized ovum becomes implanted in the uterine wallBwhen bone development beginsCwhen the neural tube fusesDwith birth5By the end of the period of the embryoAthe embryo is recognizable as a tiny human beingBthe embryo is just beginning a state of rapid growthCmuscular development is rapidDthe embryo is beginning to develop finger and toe buds and primitive facial features6The period during prenatal development in which the developing organism is most susceptible or vulnerable to environmental intrusions is the period of theAovumBzygoteCembryoDfetus7In the period of the embryo the inner mass of the organism differentiates into three layers known asAectoderm mesoderm and endodermBplacenta amnion and chorionCblastocyst trophoblast and zygoteDskin muscle and bone8The embryonic stage is the stage of greatest vulnerability to environmental changes becauseAthe placenta is not yet fully formedBorgan formation is taking placeCthe amniotic sac is still developingDthe bones of the skeleton have not yet formed9Ectoderm is to hair nails and sensory cells as endoderm is toAskin glandsBcirculatory systemsCbronchia and lungsDnervous system10The amniotic sac the placenta and the umbilical cord develop duringAthe germinal periodBthe period of the embryoCthe fetal periodDlabour11The semipermeable membranes that separate maternal and child bloodstreams are located in theAamniotic sacBamniotic fluidCplacentaDumbilical cord12When a blood test was performed on Cindys fetus the doctors found some of Cindys red blood cells in the fetus circulatory system We know that thisAis normal since the mothers red blood cells are shared with the fetusBindicates a problem with the blastocyst which should not contain red blood cellsCindicates a problem with the placenta which should block the mothers red blood cellsDindicates a problem with the amnion which should eliminate the mothers red blood cells13The doctor has told Sheryl and Jason that their unborn baby is having problems because of significant changes in the temperature around the fetus The most likely explanation for this problem is that thehas failed to perform its protective functionAuterusBamnionCplacentaDectoderm14Your sister has just had a spontaneous abortion or miscarriage She was most likely at what stage of prenatal developmentAperiod of the ovumBgerminal periodCperiod of the embryoDperiod of the fetus15The longest period of pregnancy is theAembryonic periodBfetal periodCzygotic periodDgerminal period16Maternal reports of movement during pregnancy usually begin at aboutA16 weeksB20 weeksC24 weeksD28 weeks17The premature infants inability to produce the liquid surfactant often results inArespiratory distress syndromeBpremature deliveryCdamage to the infants corneaDdamage to the infants intestines18The age of viability in prenatal development is considered to beweeksA20 to 21B22 to 26C27 to 28D2919On Day 5 a hollow ball of cells ie thehatches from the coat that surrounds the eggAplacentaBblastocystCmorulaDzygote20The transition from zygote to embryo involvesAimplantationBfertilizationCorgan developmentDblastocyst differentiation21What is the duration of the embryonic periodAten daysBtwo weeksCsix weeksDseven months22The bag that eventually develops around an embryo is called theAplacentaBamnionCtrophoblastDendoderm23Sally who is 5 weeks pregnant and Norma who is 5 months pregnant both work in a plant that produces toxic chemicals One day there is an accident and both are exposed to a number of these chemicals Sallys physician tells her that they are going to watch for liver damage in the organism she is carrying whereas Normas physician tells her that her fetus may be born smaller than expected The physicians likely have such differing concerns becauseAthe effects of chemicals on prenatal development can never be predictedBone fetus is female while the other is male and thus more vulnerable to damageCdiffering aspects of development are vulnerable to damage at different times during developmentDolder doctors are taught to focus on organ formation while newly trained physicians focus on global aspects of development24Critical periods of developmentAdo not exist for any of the bodys structures brain heart legs etcBonly apply to the development of the inner organs of a personCexist for virtually every structure in the bodyDwere first recognized by Charles Darwin25Drugs eg cocaine and thalidomide and diseases eg rubella that cross the placental barrier are termedAprenatal toxinsBpoisonsCteratogensDprenatal pathogens
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