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.
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