objecves - 1.cdn.edl.io€¦ · creates our sex cells (sperm or egg) today: how? fer&lizaon: a...
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Objec&ves:• Todaywewill…
– Handbackquizzes.Trackourprogress.– Notes:HumanDevelopment&StemCells– Ar&cleaboutuseofStemCellstoreverseparalysisinmice
• Sothatwecan…– Usethewords:Fer&liza&on,Zygote,Differen&a&on,StemCellstodescribethestepsofearlydevelopment.
– Weighthemedicalbenefitsofstemcellresearchwithpoten&alethicalconcerns.
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BellWork:
1) Pleasetakeoutthehomeworkyoucompletedtoprepareforthenervoussystem&eyequiz.Addittoyourhomeworklog.Iwillbearoundtostampit!
2) IamhandingbackyourlastTWOquizzes.PleaseenterthemintoyourUnit5Tracker!
3) Pleasetakeoutyournotesonthenervoussystem(5-10).Usethesetohelpyoumakecorrec&onsontheNervousSystemsec.onofyourquiz.
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OverviewoftheNervousSystem:________NervousSystem _________NervousSystem
• Brain:• SpinalCord:
• Nerves:• SenseOrgans:
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DebriefQuiz:
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DebriefQuiz:
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QuizDebrief:
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QuizDebrief:
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Review:
Meiosis=aspecialtypeofcelldivisionthatcreatesoursexcells(spermoregg)
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Today:
How
?
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Fer&liza&on:
A sperm cell unites with an egg cell to form a single cell called a zygote.
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HumanDevelopment
Ourbodiesaremadeofabout100trillioncells:
100,000,000,000,000.
Howmanycellsdidwestartwith?
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After fertilization, the original zygote undergoes cell division (mitosis) to
produce enough cells.
Zygote
Embryo
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Differen&a&on:Whencellsbecome“specialized”(akaturnintodifferenttypesofcells…)
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HumanDevelopment
• Video:hap://www.youtube.com/watch?v=UgT5rUQ9EmQ&feature=related• Lookfor:
– Crea&onofthezygote– Divisionoftheembryo– Differen&a&onofcellsintheembryo
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HumanDevelopment:
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QuickCheckforUnderstanding:Pleasechoose“true”or“false”foreachstatement:
a. Duringdifferen&a&on,acelltakesonaspecialfunc&on.
b. Differen&a&onisusuallypermanent(inhumans)c. Anexampleofdifferen&a&onwouldbeasperm
celluni&ngwithaneggcell.d. Anexampleofdifferen&a&onwouldbean
embryocellbecominganervecell.
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HumanDevelopment:
Differentiation!
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StemCells:Stemcells=Cellsthathavenotyetdifferen&ated!
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Ar&cle:“StemCellsRepairDamagedSpinalCordsinMice”
• Pleasereadthear&clealoudwithyourpartner.Discusstheques&ons&answerincompletesentences.
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TypesofStemCells:
1) EmbryonicStemCells– Comefromearlyembryos– “Pluripotent”
2) AdultStemCells– Comefromspecific&ssuesinthebody– “Mul&potent”
• Ex:Bonemarrow&ssuecanproduceseveraldifferenttypesofbloodcells.
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Poten&alBenefitsofStemCellResearch:
Repairdamaged&ssuethatcannotrepairitself.
Leukemia (cancer of the blood cells)
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EthicalDebateoverStemCellResearch:
Destruc&onofhumanembryosvs.
Opportunitytosavelivesbycuringdiseases&repairinginjuries
ExploringSolu&onstoEthicalConcerns:
1) Getcellsfromembryowithoutdestroyingtheembryo2) Othersourcesofstemcells(umbilicalcord?)3) Findawaytoreversedifferen&a&onàcreate“induced”stemcellsfrom
adultcells
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Homework:
Pleasefinishques&onsforstemcellar&cle(includinghonorsextension!)