4 excretory ppt - ms. kim€¦ · the urinary system •regulates the removal of waste •main...
TRANSCRIPT
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ExcretorySystemLESSON3
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LearningGoals1. Howdoestheurinarysystemhelpmaintainhomeostasis?
2. Becomefamiliarwiththeanatomyofthekidneys
3. Listthecomponentsofanephronandtheirbasicroles
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HomeostasisCellsmustregulatetheir:•ionicandpHbalance•Osmoticconcentration
WhenfacedwithWASTE,howdoesourbodyrespond?
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Deamination•Removalofanaminogroup•By-product=ammonia•Ammonia+carbondioxide =urea•Eliminatedbythekidney
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TheUrinarySystem•Regulatestheremovalofwaste•Mainorgans(1)kidneys(2)UrinarybladderButalsoincludestheuretersandurethra
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Kidneys(1) RenalCortex(2) RenalMedulla(3) RenalPelvis
•Renalarteryà kidney•Bloodisfiltered•Kidneyà renalveins
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Besidesurineformation…thekidneyisalsoinvolvedinregulating:
(1) Bloodvolumeandpressure(2) Electrolytebalance(3) BloodpH(4) RedBloodCellproduction
(Erythropoietin)
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RedBloodCellProduction
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TheNephron•Conservenutrientsandwater•Balanceions•Concentratewastes
>Interstitialfluid
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3InterrelatedProcesses1)Filtration– fluidmovesfromthebloodintothebowman’scapsule
2)Reabsorption– transferssolutes/waterfromnephron,backintoblood
3)Secretion– removalofwastefromthebloodandinterstitialintothenephron
Whatdoesthispathwaylooklike?
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Pathway
Afferentarteriolesà kidneyàglomerulus/Bowman’sCapsuleàProximalconvolutedtubuleà LoopofHenleà DistalCTàCollectingDucts
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PathwayFiltration•Bloodentersthekidneyfromtheafferentarterioles•GlomerulusandBowman’scapsulefilterblood
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PathwayReabsorption/Secretion•FiltratemovesthroughPCTwhereessentialsolutesandwaterarereabsorbedintotheperitubularcapillaries•DescendingportionoftheLoopofHenle,wherewaterisreabsorbed
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Pathway
Reabsorption/Secretion•Ascendingportion,ionsareremoved•AttheDCT,additionalwaterandsaltsareremoved•Inthecollectingduct,additionalwater maybeabsorbed•Urineiscollectedintherenalpelvis,whereflowstothebladder tobestored
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KeyPoint#1:Homeostasis?(1) Excretingwaste(2) Bloodvolumeandpressure(3) Electrolyte(ion)balance(4) BloodpH(5) RedBloodCellproduction(Erythropoietin)
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KeyPoint#2:
KidneyAnatomy
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KeyPoint#3:
Nephron&theexcretionpathway