Unit 2: Cells
Chapter 9-1
Cellular Respiration
2007-08
Learning Goals
1. Explain the process of cellular
respiration including the equation
with reactants and products.
2. Describe the 3 steps for cellular
respiration including location,
reactants and products, and amount
of ATP produced.
3. Draw the mitochondria and label its
parts.
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Cellular Respiration
•
Mitochondria break down food
(glucose) molecules to make ATP
–
•
•
ATP will provide energy for other
processes
Occurs in the mitochondria
The Chemical Equation
C6H12O6 + 6 O2  6 CO2 + 6 H2O + energy
Glucose + Oxygen 
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Carbon dioxide + Water + Energy
Flow Map
• Here is the chemical equation:
• C6H12O6 + 6 O2  6 CO2 + 6 H2O + energy
• From MEMORY (without using your
notes), write out the word equation and
draw pictures to complete the picture
equation.
• You WILL need to memorize this
equation as well as the photosynthesis
equation so practice (quiz yourselves)
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Mitochondria
•
Outer membrane = outside of
mitochondria
Inner membrane = wavy inner layer
•
–
–
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Cristae = folds of the inner membrane
Matrix = the space within the inner
membrane
Overview: 3 steps
1. Glycolysis
2. Krebs Cycle
3. Electron Transport Chain (ETC)
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1. Glycolysis
• Glucose split into two pyruvate
– Anaerobic = no oxygen is required
• Takes place in the cytoplasm (outside
mitochondria)
• 2 ATPs are made
Glucose
(6 carbons)
2 Pyruvates
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(3 carbons)
2 ATP
Glycolysis: takes place in the cytoplasm
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2. Krebs Cycle
•
•
•
•
Pyruvate broken into CO2
NADH & FADH2 are made (stored
energy)
Occurs in the matrix of the mitochondria.
2 ATP’s are made
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Kreb’s Cycle: occurs in the
mitochondria’s matrix
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Matrix
3. Electron Transport Chain (ETC)
•
Most of the ATP energy of cellular respiration
is made by the ETC
– Energy from NADH & FADH2 pumps H+
across the cristae, helping make ATP
• Aerobic = oxygen is required
– O2 accepts the H+ at the end of the ETC to
make H2O
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• Occurs in the cristae of the mitochondria.
• About 32 ATPs are made!!!
Electron Transport Chain:
occurs in the mitochondria’s cristae
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Cristae: Inner Membrane
•Cellular Respiration:
•Total amount of ATP
made from
1 glucose = 36 ATP’s
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Fermentation
• Anaerobic Respiration: releases
energy from food when O2 is not
available.
• Allows for the cell to continue making
a small amount of ATP.
– Produces 2 ATP per 1 glucose molecule
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Fermentation v. Respiration
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Comparing Photosynthesis
and Cellular Respiration
2007-08
Learning Goals
1. Explain the process of cellular
respiration including the equation
with reactants and products.
2. Describe the 3 steps for cellular
respiration including location,
reactants and products, and amount
of ATP produced.
2007-08