Cellular Respiration!
Converting Chemical Energy from Carbohydrates
into Chemical Energy of ATP!
Cellular Respiration (Aerobic )!
•  How do cells transform
matter and energy?"
!
•  What are the major
inputs and outputs of
cell respiration?"
!
•  What is the relationship
between cell respiration
and study
photosynthesis?!
Cellular Respiration and Photosynthesis!
• 
These are ‘opposite’
processes!
• 
The products of
photosynthesis are the
reactants of respiration
and vice versa. !
• 
Energy stored through
photosynthesis is
released through
cellular respiration !
Cellular Respiration and Photosynthesis!
• !Photosynthesis stores small
packets of energy in a
larger packet.!
ª Like turning in one
hundred $1 bills to get a
$100 bill!
• 
Cell Respiration takes a lot
of energy and breaks it into
smaller packets.!
ª Like turning in a $100
bill and getting five $20
bills.!
Cellular Respiration Overview!
In the mitochondria of living things, oxygen helps the
break- down of sugars (glucose) to release energy
useable by the cell (ATP)!
Products and Reactants!
(1) C6H12O6 + (6) O2
(6) CO2 + (6) H2O + ATP !!
Cellular Respiration Overview!
•  Glycolysis is the anaerobic process of breaking down
glucose to generate ATP!
•  Krebs Cycle and Electron Transport require oxygen to
further break down carbon molecules to generate ATP!
O2
Pyruvic acid
Mitochondria
Glucose
Glycolysis
2
Krebs
Cycle
H+
CO2
36
Electron
Transport
Chain
H 2O
Glycolysis!
• 
Glucose breaks down
into smaller carbon
molecules and ATP
(energy)!
• 
Similar to reversing
the final stage of
photosynthesis when
smaller carbon
molecules were used
to make glucose!
Krebs Cycle!
• 
Smaller carbon
molecules from
glycolysis break
down into
carbon dioxide
and electrons,
which are used
to generate ATP
(energy) !
• 
Similar - in
reverse - to the
light
independent
reactions in
photosynthesis!
Electron Transport Chain!
Electron Transport Chain
• 
Electrons generated during glycolysis
and Kreb’s cycle are used to generate
ATP!
• 
At the end they come together with
oxygen to form water !
• 
Again, similar, but in reverse of the
electron transport chain in the light
dependent reactions of photosynthesis!
Energy Transformed - Cell Respiration!
• 
36 ATP units are released from one glucose unit!
• 
A unit of glucose molecules contains 686 kcal of stored
energy. A unit of ATP stores 7.5 kcal. !
• 
How efficient is the transformation from energy stored in
glucose to energy released as ATP?!