1. Ch 9- Cellular Respiration
Equation for cellular respiration
6 O₂+ C₆H₁₂O₆→ 6 CO₂+ 6 H₂O + Energy
Photosynthesis?
6 CO₂+ 6 H₂O + Energy→6 O₂+ C₆H₁₂O₆
Occurs in 3 stages
Glycolysis- anaerobic, takes place in cytoplasm, products enter mitochondria
Kreb’s Cycle- aerobic (requires oxygen), occurs in mitochondria
Citric Acid Cycle
Electron transport chain- aerobic, occurs in mitochondria

2. Main Stages of Cell respiration
Glycolysis needs 2 ATP molecules to begin process
What happens during glycolysis?
2 molecules of pyruvic acid, 2 molecules of ATP, and 2 molecules of NADH are produced
Kreb’s Cycle- Citric Acid Cycle
During cycle, pyruvic acid is broken down into carbon dioxide in a series of energy extracting reactions
Energy output from one molecule of pyruvic acid= 4 NADH, 1 FADH₂, and 1 molecule of ATP
NADH, FADH ₂ are high energy electron carriers

3. Main Stages cont.
Electron transport chain- takes place in mitochondria
Uses high energy electrons from Krebs cycle to convert ADP to ATP
8 NADH and 2 FADH ₂ from Kreb’s cycle
Each NADH produces 3 molecules of ATP
Each FADH ₂ produces 2 molecules of ATP
Oxygen serves as last electron acceptor, and water is last product made

4. Totals Glycolysis- 2 ATP and 2 NADH
2 NADH produces 4 ATP
Krebs Cycle- 2 ATP, 8 NADH, and 2 FADH ₂
Electron Transport Chain- uses NADH and FADH ₂ to produce ATP
NADH produces 24 ATP
FADH ₂ produces 4 ATP
Total ATP molecules formed during cellular respiration= 36