Chapter 7
Cellular Respiration
“Breath”
The Card II – Cellular Respiration
Heterotrophs
Food
C6H12O6 + 6O2
6CO2+ 6H2O+ Energy
(ATP)
Heterotrophs need food to live, they convert that food into
usable energy (glucose) for the cell to make ATP
Cellular Respiration
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Molecules on the earth are all recycled
and reused.
ATP- adenosine triphosphate is an
energy storing molecule.
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it has three parts: ribosome (5 carbon sugar,
adenine, and 3 phosphates)
all cells must have this to stay alive!
Cellular Respiration
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ADP – adenosine diphosphate, which
is ATP with one phosphate missing.
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It is lower in energy than ATP but needed in
the process for making energy in the cell
Energy cycles from ATP to ADP back
to ATP. In this way no energy is ever
lost.
Action: ATP Cycle in Cells

ATP
Energy from Food
Energy for cells
ADP
Cellular Respiration

Heterotrophs- organisms that can not
make their own food (animals)
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these organisms need to rely on food for
the making of energy (ATP)
use oxygen and the molecules in food to
make the glucose (organic compound)
Then that organic compound glucose
makes ATP energy for the cell.
Cellular Respiration
Cellular respiration – process of
energy making in a cell involving the
mitochondria, glycolysis, Krebs cycle,
and electron transport system.
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Glycolysis - where glucose is converted to
pyruvate and energy (small amount) is
released.
Cellular Respiration

Krebs cycle – breaks down acetyl
CoA to form CO2, ATP, NaDH,
FaDPH2
Coenzyme A
NAD
Acetyl CoA
Citric Acid
FAD
Citric Acid Cycle = 2ATP
Pyruvate
oxaloacetic acid
Fumaric Acid
Succinic Acid
2X
Citric Acid
ATG
Cellular Respiration
Electron transport chain/system –
energy transfer that makes 32 ATP
molecules
 - made when H+ is released
 - NADH
NAD
 - FADH2
FAD
 - takes place in the inner membrane of
the mitochondria

Cellular Respiration
Fermentation – happens when there is
no O2 present
Pyruvate
Alcohol (no O2 present)
+NADH

Ethanol + NAD+ = CO2
(runner’s high)
NADH
Latic Acid + NAD+
(muscle pain!)
Cellular Respiration

Calorie – amount of heat energy needed
to raise the temperature of one gram of
water one degree Celsius.

Aerobic - reactions that require O2
Anaerobic – reactions that happen
without O2
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Quiz 10 Cellular Respiration
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1. What organelle of the cell directs and
carries out cellular respiration?
2. What is the end result of cellular
respiration in the cell?
3. What happens if there is no oxygen
present for the cells to finish cellular
respiration?
4. How many ATP are produced at the end
of the cycle?