cellular respiration & fermentation: ch. 7.4 - 7.6
TRANSCRIPT
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Cellular Respiration & Fermentation: Ch. 7.4 - 7.6
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Objectives
1. Importance of mitochondrion’s structure
2. Inputs & outputs of cellular respiration
3. Anaerobic vs. Aerobic conditions
4. Importance of fermentation; when/where it occurs
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Transfer of Energy
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We Need Energy!
• All living things need energy.
• Forms of Energy: 1. Food = chemical energy
2. ATP = cell energy
• Cells make energy in 2 ways:• Photosynthesis: takes place
in chloroplasts
• Cellular Respiration: takes place in mitochondria
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Mitochondrion
• Ideal place to make energy. Why?
• Structure is key. What do you notice?
• Many folds --> large surface area– allows for a lot of ATP
production
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Inputs vs. Outputs in Cellular Respiration
Inputs
Outputs
Cellular Respiration
C6H12O6 + 6O2 ---> 6CO2 + 6H2O + ATP (Energy!)
Glucose + Oxygen ---> Carbon Dioxide + Water + ATP (38)
•Is cellular respiration aerobic or anaerobic?
Cellular respiration is aerobic:
requires oxygen
Aerobic. Why?
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The End Product
• The result of cellular respiration is the generation of ATP
• 1 molecule glucose --> 38 molecules of ATP!
• This is what keeps us alive!
38ATP
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Cellular Respiration: the relationship to breathing
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No Oxygen?
• Do all cells need oxygen all of the time?• Anaerobic environment:
– w/o oxygen
• What are some examples? • Sprinting
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Fermentation
• Fermentation:– Makes ATP w/o using
oxygen
• Sprinting– Lungs and blood can’t
supply oxygen fast enough to meet muscles needs
– Body resorts to fermentation for short bursts of activity
• What happens?
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Feel the Burn!• Fermentation in a muscle cell produces a waste product called lactic acid --> burns!
• Buildup of lactic acid causes soreness during and after exercise
• Body eventually converts lactic acid back to pyruvic acid
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More Fermentation
• Yeast (microscopic fungus) cells:
• In anaerobic environment it produces alcohol and CO2 --> beer
• Makes bread rise• Sharp flavor of cheese
– Due to lactic acid
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Fermentation
performed by
Muscle cells Bacterial fungi yeast
Lactic acid Ethyl alcohol CO2
Sore muscles Sour/sharp taste bubbles
produces produces & releases
that in the body causes
that in food causes in bread causes