What is Cellular Respiration?

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What is Cellular Respiration?
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Cellular Respiration Overview

• Transformation of chemical energy in food into
  chemical energy cells can use ATP
• These reactions proceed the same way in plants
  and animals. Process is called cellular
  respiration
• Overall Reaction
• C6H12O6 6O2 ? 6CO2 6H2O

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• For Animals- Once food is consumed, an organism
  has to transform it into energy that can be used
  by the organism.
• This process is cellular respiration

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Glucose Oxygen? Carbon Dioxide Water Energy
The equation in WORDS
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What is the chemical equation for cellular
respiration?
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• CELLULAR RESPIRATION EQUATION
•        
• C6H12O6 6O2 ?  6CO2   6H2O  Energy
• PHOTOSYNTHESIS EQUATION
•        
• 6CO2   6H2O LIGHT ?  C6H12O6  6O2

END
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3 Steps

• There are three steps in the process of cellular
  respiration
• 1. Glycolysis
• 2. Krebs Cycle (Citric Acid Cycle)
• 3. Electron transport chain.
• Get Krunk Everyone

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STEP 1 GLYCOLYSIS

• occurs in the cytoplasm
• Turns glucose into pyruvate
• 2 ATPs are made

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Step 2 KREBS CYCLE (Citric Acid Cycle)

• occurs in the mitochondria
• It breaks down CO2
• 2 ATPs are made
• Also known as the Citric Acid Cycle

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Step 3 ELECTRON TRANSPORT CHAIN

• Occurs in mitochondria
• Electron carriers loaded with electrons and
  protons from the Krebs cycle move to this
  chain-like a series of steps (staircase).
• As electrons drop down stairs, energy released to
  form a total of 32 ATP
• Oxygen waits at bottom of staircase, picks up
  electrons and protons and in doing so becomes
  water

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Energy Tally

• 36 ATP for aerobic vs. 2 ATP for anaerobic
• Glycolysis 2 ATP
• Krebs 2 ATP
• Electron Transport 32 ATP
• 36 ATP
• Anaerobic organisms cant be too energetic but
  are important for global recycling of carbon

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Anaerobic Cellular Respiration

• Some organisms thrive in environments with little
  or no oxygen
• Marshes, bogs, gut of animals, sewage treatment
  ponds
• No oxygen used anaerobic
• Results in no more ATP, final steps in these
  pathways serve ONLY to regenerate NAD so it can
  return to pick up more electrons and hydrogens in
  glycolysis.
• End products such as ethanol and CO2 (single cell
  fungi (yeast) in beer/bread) or lactic acid
  (muscle cells)

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Aerobic Cellular Respiration

• Oxygen requiredaerobic
• 2 more sets of reactions which occur in a
  specialized structure within the cell called the
  mitochondria
• 1. Krebs Cycle
• 2. Electron Transport Chain