Cellular Respiration
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Cellular Respiration. Comparing Photosynthesis & Cellular Respiration. Living things need energy…. Our bodies have a lot of work to do every day… Moving muscles, Building essential molecules, and Transporting substances across cell membranes. Where do we get energy?.

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Cellular Respiration

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Cellular respiration

Cellular Respiration

Comparing photosynthesis cellular respiration

Comparing Photosynthesis & Cellular Respiration

Cellular respiration

Living things need energy…

  • Our bodies have a lot of work to do every day…

    • Moving muscles,

    • Building essential molecules, and

    • Transporting substances across cell membranes.

Where do we get energy

Where do we get energy?

  • Food provides the energy living things need to grow and reproduce.

  • Food is the source of the material our cells use to build new molecules.

Cellular respiration

How much energy is present in food?

  • Quite a lot!

  • One gram of the sugar glucose (C6H12O6) when burned in the presence of oxygen, releases 3,811 calories of heat energy.

  • A calorie is the amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius.

Cellular respiration

What is cellular respiration?

  • Cellular respiration is the process that releases energy by breaking down glucose and other food molecules in the presence of oxygen.

6O2 + C6H12O6

6CO2 + 6H2O + ATP energy

carbon dioxide + water + ATP

oxygen + glucose

Breakdown of Glucose (exergonic reaction) releases energy in a form that can be used by cells


Cellular respiration

Where does cellular respiration take place?


  • The beginning pathway of cellular respiration, glycolysis, takes place in the cell cytoplasm.

  • The two remaining pathways—the Krebs Cycle (matrix) and

  • ETC electrontransport(Cristae)—take place inside the mitochondria of the cell.

Cellular respiration

CR occurs in almost all organisms.

CR occurs in organelles called _____________


Mitochondrial structure:

Inner membrane

Outer membrane




Cellular respiration

Aerobic Cellular respiration

  • Glycolysis: a glucose molecule is split in half to produce two molecules of pyruvic acid 2(3C sugar) = 2 ATP made

  • Krebs Cycle: pyruvic acid is broken down to produce carbon dioxide, NAD, FADH2 & 2 ATP. Sometimes called the citric acid cycle because citric acid is first formed.

  • Electron Transport Chain: uses the high-energy electrons in NAD & FADH2 from the Krebs Cycle to convert ADP to ATP = 32 total: H2O is produced


2 ATP 2 ATP 32 ATP

Cellular respiration


  • Gycolysis 2 ATP

  • Krebs Cycle 2 ATP

  • Electron Transport Chain 32 ATP

  • Total = 36 ATP

Cellular respiration

What happens if oxygen is not available?

  • Glycolysis is then followed by a different pathway.

  • The combined process of this pathway and glycolysis is called fermentation.

  • Fermentation releases energy from food molecules by producing ATP in the absence of oxygen (Anaerobic process)

Cellular respiration

Anaerobic Processes

  • No oxygen is required for these processes.

  • Includes glycolysis ( the breakdown of glucose) and fermentation.

  • Some bacteria and yeast are examples of anaerobes.

Cellular respiration


  • Pyruvic Acid can be broken down by:

    • Alcoholic fermentation..AF

    • Lactic acid fermentation…LAF

  • AF makes ethyl alcohol and CO2– yeast can ferment apple juice to fill a balloon.

  • LAF makes lactic acid. It can build up in muscles during strenuous exercise and cause burning and soreness.

Cellular respiration

Book Video to summarize Cellular Respiration:


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