cell processes & energy respiration chapter 2 section 2
TRANSCRIPT
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Cell Processes & Energy
Respiration
Chapter 2
Section 2
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Respiration
• Cells break down simple food molecules, such as glucose, and release the energy they contain– Requires oxygen, O2
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Respiration Equation
• C6H12O6 + 6 O2 6 CO2 + 6 H2O + energy
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Respiration (Step 1)
• Glucose is broken down into small molecules in the cytoplasm– Only a little bit of energy is released
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Respiration (Step 2)
• The mitochondria break down the small molecules in the presence of oxygen, O2
– Lots of energy is released!!!
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Photosynthesis vs. Respiration
• Can be thought of as opposite processes
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Fermentation
• Allows cells to break down sugars without oxygen– Produces either…
• Alcohol• Lactic Acid
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Alcoholic Fermentation
• When yeast breaks down sugars without oxygen– Beer– Wine
• Gives off Carbon dioxide, CO2
– Produces bubbles
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Lactic Acid Fermentation
• Produced by muscle cells when they do not have enough O2
– 100m sprint• Sore, wobbly legs