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4.4 Overview of Cellular Respiration
KEY CONCEPT
The overall process of cellular respiration converts
sugar into ATP using oxygen.
4.4 Overview of Cellular Respiration
Cellular respiration makes ATP by breaking down sugars.
• Cellular respiration is aerobic, or requires oxygen.
• Aerobic stages take place in mitochondria.
mitochondrion
animal cell
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What are the Stages of Cellular Respiration?
Glycolysis
The Krebs Cycle
The Electron Transport Chain
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Review of Mitochondria Structure
Smooth outer Membrane
Folded inner membrane
Folds called Cristae
Space inside cristae called the Matrix Copyright Cmassengale
4.4 Overview of Cellular Respiration
• Glycolysis must take place first.
– anaerobic process (does not require oxygen)
– takes place in cytoplasm
– splits glucose into two three-carbon molecules
– produces two ATP molecules
4.4 Overview of Cellular Respiration
Cellular respiration is like a mirror image of
photosynthesis.
• The Krebs cycle:
– takes place in
mitochondrial matrix
– breaks down three-carbon
molecules from glycolysis
– makes a small amount of
ATP
– releases carbon dioxide 6H O 2
6CO 2
6O 2
mitochondrion
matrix (area enclosed
by inner membrane)
inner membrane
ATP
ATP
energy
energy from
glycolysis
1
2
4
3
and
and
and
Krebs Cycle
4.4 Overview of Cellular Respiration
6H O 2
6CO 2
6O 2
mitochondrion
matrix (area enclosed
by inner membrane)
inner membrane
ATP
ATP
energy
energy from
glycolysis
1
2
4
3
and
and
and
• The electron transport chain produces a large amount of
ATP.
– takes place in inner
membrane
– energy transferred to
electron transport
chain
– oxygen enters
process
– ATP produced
– water released as a
waste product
Electron Transport
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Where do the Stages of Cellular Respiration take
place?
Glycolysis - CYTOPLASM
Krebs Cycle – MITOCHONDRIAL MATRIX
Electron Transport Chain – INNER MEMBRANE
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Glycolysis Summary Takes place in the Cytoplasm
Anaerobic (Doesn’t Use Oxygen)
Requires input of 2 ATP
produces 4 ATP
Glucose split into two molecules of Pyruvate or Pyruvic Acid
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Krebs Cycle Summary Requires Oxygen (Aerobic) Turns twice per glucose molecule Produces two ATP Takes place in matrix of mitochondria
1937 Hans Kreb
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Electron Transport Chain Summary
34 ATP Produced
H2O Produced
Occurs Across Inner Mitochondrial membrane
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4.4 Overview of Cellular Respiration
• The equation for the overall process is:
C6H12O6 + 6O2 6CO2 + 6H2O
• The reactants in photosynthesis are the same as the
products of cellular respiration.
Word Roots
Knowing word roots can improve your vocabulary!
aero- = air (aerobic: chemical reaction using oxygen)
an- = not (anaerobic: chemical reaction not using oxygen)
chemi- = chemical (chemiosmosis: the production of ATP using the energy of hydrogen ion)
glyco- = sweet; -lysis = split (glycolysis: the splitting of glucose into pyruvate)
