1. Cellular Respiration
Converting Chemical Energy from Carbohydrates into Chemical Energy of ATP

2. 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?

3. 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

4. Cellular Respiration and Photosynthesis
• Photosynthesis stores small packets of energy in a larger packet.
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.
Like turning in a $100 bill and getting five $20 bills.

5. 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) O (6) CO2 + (6) H2O + ATP

6. 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 H+
Electron Transport Chain
Glycolysis
Krebs Cycle
CO2
H2O 2 36

7. Glycolysis
Glucose (6 carbon sugar) breaks down into pyruvate (3 carbon molecules ) and ATP (energy)
Similar to reversing the final stage of photosynthesis when two 3-carbon sugars were used to make glucose

8. Krebs Cycle
Pyruvate (3 carbon) breaks down into carbon dioxide (1 carbon) and electrons are used to generate ATP (energy)
Similar - in reverse - to the Calvin cycle in photosynthesis

9. 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
Electron Transport Chain

10. 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?