Download Cellular Respiration

Cellular Respiration
Cellular Respiration

The process in which mitochondria break
down food molecules to produce ATP.
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C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Comparison of Photosynthesis &
Cellular Respiration
Photosynthesis
Cellular Respiration
Food synthesized
Food broken down
Energy from sun stored in
glucose
CO2 taken in
Energy of glucose released
Oxygen given off
Oxygen taken in
Produces sugars
Produces CO2 & H2O
Requires light
Does not require light
CO2 given off
Occurs only in presence of Occurs in all living cells
chlorophyll
Cellular Respiration
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3 stages
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Glycolysis (anaerobic)
Citric Acid Cycle (aerobic)
The Electron Transport Chain (aerobic)
Glycolysis

A series of chemical reactions in the
cytoplasm of the cell that break down glucose.
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2 molecules of ATP are used to produce 4
molecules of ATP
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CO2 is given off.
The Citric Acid Cycle
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Also called the Krebs cycle.
Similar to the Calvin cycle (Dark reaction)
1 glucose molecule is broken down in 2 turns of the
cycle.
Every 2 turn of the cycle 2 molecule of ATP and 4
molecules of CO2 are produced.
2 electron carriers are used NAD + & FAD
NAD +  NADH
FAD  FADH2
The electron carriers each pass 2 energized electrons
along to the electron transport chain.
Electron Transport Chain

NADH & FADH2 deliver energized e- at the
top of the chain.
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Electrons are passed from protein to protein
in the chain.
When no Oxygen is present
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In the absence of oxygen an anaerobic
process can produce small amounts of ATP to
keep the cell from dying.

This process is called Fermentation.
Fermentation
Occurs during heavy exercise when your cells are without

oxygen for a short period of time.
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It follows glycolysis
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Produces ATP until oxygen is available.
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2 types of fermentation:
1.
Lactic Acid Fermentation
2.
Alcoholic Fermentation
Comparison of Fermentation to
Cellular Respiration
Lactic Acid
Alcoholic
Fermentation Fermentation
Cellular
Respiration
glucose
Glucose
glucose
glycolysis
Glycolysis
glycolysis
CO2
CO2
Lactic Acid
alcohol
water
2 ATP
2 ATP
32 ATP