1.  CELLULAR RESPIRATION 
Biology I

2. INTRODUCTION TO CELLULAR RESPIRATION
Both photosynthesis and cellular respiration provide energy for life.
Photosynthesis uses solar energy to produce
glucose and O2 from CO2 and H2O
6CO2 + 6H20 + ATP C6H12O6 + 6O2
Occurs in Chloroplasts

3. during the oxidation of glucose to CO2 and H2O
Cellular respiration makes ATP and consumes O2
during the oxidation of glucose to CO2 and H2O
C6H12O6 + 6O CO2 + 6H2O + ATP
Occurs in mitochondria
So what is the relationship between photosynthesis and cellular respiration?

4. + Sunlight energy ECOSYSTEM Photosynthesis in chloroplasts CO2 Glucose
ATP
ECOSYSTEM
Sunlight energy
Photosynthesis in chloroplasts
Cellular respiration in mitochondria
(for cellular work)
Heat energy +

5. Breathing (respiration) provides for the exchange of O2 and CO2 between an organism and its environment.
Happens in the lungs

6. Cellular respiration breaks down glucose molecules and banks their energy in ATP.
Occurs in the mitochondrion of cells.
C6H12O6
CO2 6
H2O
ATPs
Glucose
Oxygen gas
Carbon dioxide
Water
Energy O2 +

7. What is the relationship between respiration and cellular respiration?
CO2 O2
Bloodstream
Muscle cells carrying out
Cellular Respiration
Breathing
Glucose + O2
CO2 +H2O +ATP
Lungs

8. 75% used for life-sustaining activities (involuntary)
The human body uses energy from ATP for all its activities.
ATP powers almost all cellular and body activities
75% used for life-sustaining activities (involuntary)
The other 25% of this is used for...

10. Both plant and animal cells carry out the final stages of cellular respiration in their mitochondria.

11. Glucose is a main energy source used by all cells.
Cells don’t “burn” glucose. Instead, they gradually release the energy from glucose and other food compounds.
This process begins with a pathway called glycolysis.
Glycolysis releases a small amount of energy

12. First Phase – Glycolysis
Occurs in the cytoplasm
Anaerobic – no oxygen needed
Breaks down glucose into simpler substances
Produces a net gain of 2 ATP molecules

13. Second Phase – Krebs Cycle
Occurs in the mitochondria
Aerobic – oxygen required
Begins with products from glycolysis

14. Each “turn” of the Krebs Cycle yields:
Totals:
2 ATP molecules
4 CO2 molecules

15. Third Phase – Electron Transport Chain
Uses the energy stored in the products of the Krebs Cycle make 32 ATP molecules.
Water is produced as a byproduct