1. CELLULAR RESPIRATION I. Cellular Energy
Food contains usable energy. Much of
the energy is stored in proteins,
carbohydrates, and fats. But before
you can use it, it must be transferred to
ATP through a process called cellular
respiration.
aerobic respiration – metabolic process that requires oxygen
anaerobic respiration – metabolic process that does not require oxygen

2. II. Cellular Respiration
Cellular respiration is the process cells use to harvest the energy in organic compounds, particularly glucose.
enzymes
C6H12O6 + 6O CO2 + 6H2O + ATP
glucose

3. Stages of Cellular Respiration:
Stage 1: Breakdown of
Glucose
The primary fuel for
cellular respiration is
glucose (C6H12O6).

4. Glycolysis – the break down of glucose in the cytoplasm; glycolysis uses 2 ATP but produces 4 ATP for a total net gain of 2 ATP and pyruvate

5. Stage 2: Production of ATP
When oxygen is present pyruvate
produced by glycolysis enters a
mitochondria and is converted into
ATP through a series of enzyme-assisted
chemical reactions.

6. Cellular Respiration Stage 2 – Mitochondria Stage 1 - Cytoplasm *O2 is
needed
Stage 1 - Cytoplasm

7. Two types of Fermentation:
Fermentation – occurs when O2 is
not present
Two types of Fermentation:
1. lactic acid fermentation – during
vigorous exercise pyruvate in
muscle cells is converted to lactate; lactate
or lactic acid can build up causing
muscle soreness.
2. alcoholic fermentation – pyruvate is
broken down into ethanol, this occurs in
the preparation of food and
beverages (wine, beer, and bread dough)

8. Summary of Cellular Respiration
Production of ATP
Glycolysis
2 ATP ATP
*aerobic *anaerobic
34 ATP ATP
Total 36 ATP Total 2 ATP
Oxygen present
Oxygen not present

9. Cellular Respiration
Enters
mitochondria
Up to 2 ATP

10. Which metabolic process is shown at letter B?