Cellular Respiration. Process by which cells release energy from molecules of food. Carbohydrates, fats and proteins all contain energy This energy is

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  • Cellular Respiration

  • Cellular RespirationProcess by which cells release energy from molecules of food.Carbohydrates, fats and proteins all contain energyThis energy is released gradually in a series of reactions controlled by enzymes.Release energy is stored as ATP for later use.ATP is the currency of the cell.

  • The Chemical EquationC6H12O6 + 6 02 6CO2 + 6H2O + 38 ATPGlucose + Oxygen Carbon Dioxide + Water + Stored Energy 2 ATP are used to make this process take place Net Gain = 36 ATP for 1 molecule of Glucose

  • 4 Main Steps in RespirationGlycolysisIntermediate ReactionKrebs Citric Acid CycleElectron Transport System

  • Glycolysis2 ATP are used to start the processGlucose is split into 2 3-carbon pyruvic acid moleculesSome Hydrogen is released4 ATP are made, a net gain of 2 ATPIt occurs in virtually all cells. In eukaryotes, it occurs in the cytosol.

  • http://www.science.smith.edu/departments/Biology/Bio231/glycolysis.html

  • Intermediate ReactionTakes place in the mitochondria (powerhouse of the cell)Breakdown of the 2 3-carbon pyruvic acid molecules2 carbon fragments, acetic acid are formed and2 CO2 and more hydrogen are releasedAcetic Acid is carried by Acetyl CoA to Kreb Cycle

  • Krebs Citric Acid CycleBreakdown ContinuesFour more CO2 are releasedMany more Hydrogen are released and picked up by NAD+ to form NADHTwo more ATP are made

  • http://www.science.smith.edu/departments/Biology/Bio231/krebs.html

  • Electron Transport SystemHydrogen atoms are transferred to bond with oxygen atoms to make water32 ATP are made e- power e- carriersWater wheelNet Result36 ATP produced

  • Oxygen is vital!It is the final acceptor of electrons without it the process stops.Pyruvic acid is converted to lactic acid, which accumulates in muscles causing fatigue and soreness.

  • http://www.science.smith.edu/departments/Biology/Bio231/etc.html


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