1. Cellular Respiration

3. The process that releases energy from food in the presence of oxygen
Cellular Respiration
The process that releases energy from food in the presence of oxygen

4. Processes that do NOT require oxygen are considered anaerobic
Aerobic v. Anaerobic
Oxygen is required at the very end of respiration in the electron transport chain. Cellular processes that require oxygen are aerobic
Processes that do NOT require oxygen are considered anaerobic
The three stages of Cellular respiration are: Glycolysis, 2. The Krebs Cycle, and 3. Electron Transport & ATP Synthesis

5. Glycolysis
1 molecule of glucose (a 6 carbon compound) is transformed into 2 molecules of pyruvic acid (a 3 carbon compound)
ATP Production
2 ATP molecules used to “get things going”
4 ATP molecules produced = gain of 2 ATP molecules
NADH Production
NAD+ accepts 2 electrons =the 2NADH and holds them until they can be transferred to electron chain
Glycolysis does NOT require oxygen
Happens in the CYTOPLASM of the cell

7. FOR EACH PYRUVIC ACID Molecule (there are 2)
The Krebs Cycle
Pyruvic Acid is broken down into carbon dioxide in a series of energy extracting reactions (AEROBIC)
Happens in the MATRIX of the Mitochondria
FOR EACH PYRUVIC ACID Molecule (there are 2)
Citric acid is broken down is a series of reactions
3 molecules of carbon dioxide
1 ATP, 4 NADH & 1 FADH2 (go to electron transport chain)

9. Electron Transport Chain & ATP Synthesis
 Uses high energy electrons from glycolysis and the Krebs cycle to convert ADP to ATP
Electron Transport
NADH and FADH2 pass their high energy electrons to the electron transport chain (electron carriers located in the inner membrane of mitochondria)
At the end of the chain an enzyme combines electrons with hydrogen ions and oxygen to form water
Oxygen is the final electron acceptor and the chain can’t function without it
Forms a proton gradient used is ATP production (H+ from the NADH and FADH2)
ATP Production
ATP synthase located in the inner membrane wall
ADP molecules are turned into ATP molecules

11. Together Glycolysis, the Krebs Cycle, and the Electron Transport chain results in about 36 molecules of ATP per 1 molecule of glucose.

13. Electron Transport Chain & ATP synthase
Stage
Where does it happen
Inputs
Outputs
Glycolysis
Krebs Cycle
Electron Transport Chain & ATP synthase