Download Cellular Respiration

Cellular Respiration
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Process that involves oxygen and
breaks down food molecules to release
energy.
Anaerobic respiration- without O2.
Aerobic respiration- with O2.
C6H12O6 + 6O2 6CO2 + 6H2O + Energy
(ATP)
Cellular Respiration
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Three parts:
1> Glycolysis: a series of chemical reactions
that produces 2 molecules of ATP and 2
molecules of pyruvic acid.
2> Kreb’s cycle: a series of chemical
reactions using pyruvic acid to produce ATP
and two types of reduced molecules.
3>Electron Transport Chain: the process
of extracting ATP from NADH and FADH2
Cellular Respiration
Organic
Compounds
Glycolysis
Oxygen
absent
Fermentation
(anaerobic)
Oxygen
present
Aerobic
respiration
Glycolysis (cytoplasm)
Decomposition of glucose to pyruvate
Nine intermediate products are formed
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Each rxn is catalyzed by an enzyme
Summarized steps:
1)
2 ATP are added
2)
2 NADH are produced
3)
4 ATP are produced
4)
2 pyruvate are formed
Krebs Cycle (mitochondria)
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Other names: Citric acid cycle or
tricarboxylic acid cycle
Summarized steps
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Pyruvate to acetyl-CoA
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Produced: 1 NADH and 1 CO2
Krebs Cycle
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Produced: 3 NADH, 1 FADH2, 1 ATP, 2 CO2
Oxidative Phosphorylation
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Electron Transport Chain (ETC)
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Inner membrane of the mitochondria
Electrons from NADH and FADH2 are passed along
the ETC
Electrons are passed from one carrier protein to
another along the chain, losing energy at each
step.
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Cytochromes and various other proteins participate as
carrier proteins in the chain
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Cytochrome c
Final electron acceptor is Oxygen
Fermentation
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Two common types
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Lactic Acid Fermentation
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Production of lactic acid from pyruvic acid
Alcohol Fermentation
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Production of ethyl alcohol from pyruvic acid
>No ATP production.
>Regenerate NAD+, keeps glycolysis
going to make more ATP.
Lactic Acid Fermentation
C-C-C-C-C-C
Glucose
Glycolysis
Pyruvic
acid
C-C-C
C-C-C
Lactic Acid
NAD+
NADH + H
Alcoholic Fermentation
Glucose
Glycolysis
C-C-C-C-C-C
C-C
Ethyl
Alcohol
Pyruvic
acid
C-C-C
NAD+
NADH + H+
CO2
2-carbon
compound