9.1 Chemical Pathways
Chemical Energy and Food

Calorie- amount of energy needed to raise the
temperature of 1 g of water 1oC
Flowchart
Cellular Respiration
Glucose
(C6H1206)
+
Oxygen
(02)
Go to
Section:
Glycolysis
Krebs
Cycle
Electron
Transport
Chain
Carbon
Dioxide
(CO2)
+
Water
(H2O)
Overview of Cellular Respiration

Process that releases energy by breaking down
glucose in the presence of oxygen
Glycolysis
 Anaerobic process
 no oxygen required
 Breaks
down
glucose to produce
pyruvic acid
 Occurs in
cytoplasm
 2 ATP and 2
NADH are
produced
Fermentation

Releases energy from
food molecules by
producing ATP in the
absence of oxygen
 Anaerobic

Alcohol
 Yeasts

Lactic Acid
 Yogurt, cheese,
buttermilk, sour cream
 Intense exercise
9.2 The Krebs Cycle and Electron Transport
The Krebs Cycle





Pyruvic acid left by
glycolysis is broken
down into carbon
dioxide
Occurs in the
mitochondria
Citric acid
produced
2 ATP produced
CO2 produced
Electron Transport


NADH and FADH2
carry the electrons
generated in the
Krebs Cycle to the
Electron Transport
Chain
Used to convert ADP
to ATP
 32 ATP produced
Water is produced
 Occurs in the
mitochondria

T T
h o
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a
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