Energy in a Cell Cellular Respiration. Cellular respiration: process where mitochondria break down food molecules to produce ATP. (energy)

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  • Energy in a CellCellular Respiration

  • Cellular RespirationCellular respiration: process where mitochondria break down food molecules to produce ATP. (energy)

  • Cellular RespirationThree stages in cellular respiration: glycolysis, citric acid cycle, and electron transport chain.

  • Cellular RespirationMitochondria is called the powerhouse of the cell because it is the site of cellular respiration.

  • Cellular RespirationMore work a cell does, the more mitochondria it has.

  • Cellular RespirationGlycolysis: first stage of cellular respiration.

  • Cellular RespirationTakes place in the cytoplasm of the cell.

  • Cellular RespirationOne C6H12O6 (glucose) is broken down into 2 pyruvic acid molecules. (a 3 C molecule)

  • Cellular RespirationFor every glucose molecule broken down, 2 ATP molecules are produced.

  • Cellular RespirationNext, the pyruvic acid moves into the mitochondria.

  • Cellular RespirationCitric acid cycle or Krebs cycle : Pyruvic acid is broken down in a series of reactions to produce 2 CO2 and 1 ATP and electrons are passed on to the electron transport chain.

  • Cellular RespirationElectron transport chain: series of proteins where electrons are passed.

  • Cellular RespirationEnergy is released as electrons are passed from one molecule to the next.

  • Cellular RespirationThe released energy is used to make ATP.

  • Overall:For every glucose that enters cellular respiration 36 ATP are produced.

  • Cellular RespirationCellular respiration can be classified as aerobic: cellular respiration occurs in the presence of O2.

  • Cellular RespirationMost efficient form of respiration.

  • Cellular RespirationKrebs cycle is aerobic respiration.

  • Cellular RespirationCellular respiration can also be classified as anaerobic: respiration that proceeds in the absence of O2.

  • Cellular RespirationGlycolysis is anaerobic respiration.

  • Cellular RespirationNot as efficient as aerobic. Only 2 ATP formed.

  • Cellular RespirationIn the absence of O2, pyruvic acid backs up and is eliminated 2 ways:

  • Cellular RespirationIn you and me, pyruvic acid is converted to lactic acid and builds up in the muscles.

  • Cellular RespirationIn yeast, pyruvic acid converted to CO2 and ethyl alcohol. This makes bread rise.

  • Cellular RespirationAnaerobic respiration is also called fermentation.

  • Cellular RespirationWhich molecule has the most stored energy: fat or carbohydrate?

  • Cellular RespirationFat it has available energy for 51 ATP.