Cellular Respiration Ms. Lowrie Biology 11. Energy Transformation  Chemical energy in food converted into energy that cells can use Glucose to ATP 

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  • Cellular Respiration

    Ms. LowrieBiology 11

  • Energy TransformationChemical energy in food converted into energy that cells can useGlucose to ATP

    Occurs in plants and animals

  • Figure 3 (pg 60)Cellular RespirationPhotosynthesis

  • Compare the EquationsPhotosynthesisCellular Respiration

  • SunlightHeatPhotosynthesisCellularrespirationThe Exchange of ChemicalsNote: Products from one process are reactants for the other.

  • BreathingLungsMusclecellsCellularrespirationCellular Respiration & BreathingBreathing Exchanges these gases between blood and outside air

    Cellular respirationRequires cells to exchange gases with surroundings

  • Remember Why does energy need to be transferred from glucose to ATP?

    Glucose has TOO much energyTherefore, unusableATP usable energy for cell

  • WaterCellular RespirationSummary Equation

  • Three StepsGlycolysisOccurs in cytoplasmKrebs cycleElectron transport system

    Can occur with oxygen (aerobic) or without oxygen (anaerobic) Occurs in mitochondria

  • Cytoplasm(cytosol)MitochondrionGlycolysisKrebsCycleElectronTransport

  • Step 1 Glycolysis Location:Cytoplasm

    Does NOT require oxygenAnaerobic phase

    Plants -> Bacteria -> Humans!

  • GlycolysisGlucose is broken down into 2 PGALUses 2 ATP molecules

    Each PGAL is converted into pyruvatea.k.a. pyruvic acid


  • Glycolysis Glucose Breakdown

  • Glycolysis2 NAD+ (hydrogen carrier) gain hydrogen & electronsCreates 2 NADH

    4 ATP are produced2 ATP replace those used to initiateNet gain of 2 ATP molecules

  • Glucose2 Pyruvic acid

  • CytoplasmNADHGlycolysisGlucose2Pyruvate

  • Krebs Cycle & Electron Transport SystemLocation:Mitochondria

    DO require oxygenAerobic

  • Step 2 Krebs Cycle (Citric Acid Cycle)CoA123PyruvicacidAceticacidCoenzyme AAcetyl-CoA(acetyl-coenzyme A)CO2Pyruvate changed into usable formAcetyl coenzyme A (coA)

  • Krebs CycleAcetyl-coA goes through a series of reactions with water Uses water from atmosphere

    Then enters Krebs CycleGlucose (C6H12O6) finishes breaking down

  • Carbon & Oxygen create CO2Which is released to atmosphere

    Hydrogen & electronsPicked up by NAD+ or FAD (hydrogen receptors) to form NADH or FADH2

    Net gain is 2 ATP1 from each pyruvateKrebs Cycle

  • Cycle Repeats TwiceInputAcetyl coAADP3 NAD FADKrebsCycleOutput3 CO2

  • CytoplasmMitochondriaNADHNADH & FADH2GlycolysisGlucose2PyruvateKrebsCycle2 Acetyl coA

  • Step 3 Electron Transport SystemUses hydrogen from NADH & FADH2

    Hydrogen (and its electrons) are passed down a stairway of reactions Energy is released with each step

  • Oxygen = final hydrogen electron acceptorCatches hydrogenCombines with two hydrogen Forms water

    Net gain is 34 ATP

    Electron Transport System

  • ElectronStairwayHydrogen electrons falling

    Creates energy at each step

    1/2(from food via NADH)2 H2 eEnergy forsynthesisofElectron transport chain2 e2 H1/2

  • CytoplasmMitochondriaNADHNADH & FADH2GlycolysisGlucose2PyruvateKrebsCycleElectronTransport2 Acetyl coA

  • Adding Up Aerobic ATPGlycolysis 2 ATP

    Krebs + 2 ATP

    Electron Transport+ 34 ATP 38 ATP

  • Adding Up Aerobic ATP


  • GlucoseOxygenCarbondioxideWaterEnergySummary EquationWater+

  • GlucoseOxygenWaterEnergyBalanced Equation Note Water

  • Task Electron Transport SystemUse notes & pages 62 & 63

    Answer:#3, 4(page 64)

  • #3 Electron Transport SystemSeries of hydrogen (electron) acceptorsAs hydrogen moves, energy is released

    What if energy from glucose was released all at once?Too quickCause cell damage

  • #4 Energy in Electron TransportResults in:34 ATPWater

  • The process of mitochondria breaking down glucose to produce ATP is

    PhotosynthesisCellular respirationGlycolysisCalvin cycle

  • The stages, in order, of cellular respiration are Carbon fixation, Calvin cycle, Citric acid cycleLight reactions, Krebs cycle, Electron transport systemGlycolysis, Krebs cycle, Electron transport systemCitric acid cycle, Glycolysis, Electron transport system



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