Steps of Cellular
Respiration
PGS. 131-134
STEPS OF AEROBIC RESPIRATION
Step 1: Glycolysis
(technically anaerobic, it does not require oxygen)
Location:
•Takes place in the cytoplasm
Reactants:
•Glucose (gets split to form two new molecules)
Products:
•Two, 3-carbon pyruvic acid molecules
•2 ATP molecules
Step 2: Krebs Cycle
Location:
• Series of reactions that occur in
mitochondrial matrix (liquid part)
Reactants:
•
Pyruvic acid (from glycolysis)
Products:
•
•
•
2 CO2
2 ATP
NADH & FADH2 (e- carriers)
Step 3: Electron Transport Chain and ATP Synthesis
• The “big ATP payoff”
Location:
•
Cristae, folds in the inner membrane of mitochondria
Reactants:
•
•
NADH & FADH2(Electron carriers)
O2
Products:
•
•
H2O
34 ATP
Step 3: Electron Transport Chain and ATP Synthesis
•Electron transport chain acts like a
conveyor belt, moving electrons through
a series of proteins.
•At the end of the chain, the electrons
combine with oxygen & H+ to produce
water.
Cytosol
Outer mitochondrial
membrane
H+
H+
H+ 2
Electron transport
chain proteins
2
H+
Inner
mitochondrial
membrane
Intermembrane
space
ADP + P
26
NADH
1/2 O2 + 2H+
ATP
H2O
Figure 4.22
Step 3: Electron Transport Chain and ATP Synthesis
•Hydrogen ions pass through protein
channels called ATP synthase,
generating 34 ATPs as they do.
•The process of moving
across
the membrane is called chemiosmosis
H+ ions
Cytosol
Outer mitochondrial
membrane
H+
2
H+
H+
Electron transport
chain proteins
H+
2
Inner
mitochondrial
membrane
Intermembrane
space
ADP + P
26
NADH
1/2 O2 + 2H+
ATP
H2O
Fill in this chart
Process
Glycolysis
Krebs
Cycle
Electron
Transport
Chain
Location
Reactants Products
# of ATP
Made