Cellular Respiration
Chapter 8 Section 3 Notes
•Cellular
Respiration:
You get your
energy this
way!
Overview of Cellular Respiration
• C6H12O6 + 6O2  6CO2 + 6H2O + Energy
• Cellular Respiration occurs in 2 parts:
Glycolysis
▫ An anaerobic process—does not require oxygen
Krebs Cycle & Electron Transport
▫ An aerobic process—requires oxgyen
Overview of Cellular Respiration
Cellular respiration: a set of the metabolic reactions
that take place in the mitochondria of cells to convert
sugars/other nutrients into ATP and waste products
(CO2).
• Glycolysis is
anaerobic 
doesn’t require
oxygen
• Aerobic 
requires
oxygen
Glycolysis
• Glycolysis glucose broken down in the NET PRODUCT:
2 ATP
cytoplasm
• Glycolysis produces 4 ATP but 2 are used to keep
the process going, so it is actually a net of 2
• Start with: 1 Glucose
molecule
• Use 2 ATP molecules to
convert it into a smaller
compound
• End with: 2 Pyruvate
molecules, 4 ATP molecules
• Kreb’s cycle, also called the
Citric Acidcycle
Cycle, is(aerobic
the
Kreb’s
process in which pyruvate
respiration)
is broken down into
carbon dioxide.
• At the end of glycolysis,
there are 2 ATP + 2
pyruvates
• The pyruvate still has energy
in it, so the Kreb’s Cycle
breaks it down further to get
it out to be used
NET PRODUCT:
2 ATP
• Glycolysis
produces 2
pyruvates so
they have to go
through Kreb’s
cycle twice to
get all the
energy out!
• Kreb’s cycle =
6CO2 + 2 ATP +
8 NADH + 2
FADH2
• The NADH &
FADH2
molecules move
on to next part
Electron Transport Chain
In aerobic respiration, e- transport is the
final step in breakdown of glucose
Most of the ATP is produced at this point!
NET PRODUCT:
32 ATP
Total ATP from Cellular Respiration
• The total ATP
production for
cellular
respiration is 36
ATP (2 ATP from
glycolysis, 2 ATP from
Kreb’s cycle, 32 ATP
from the electron
transport chain)
• Many prokaryotes can
live without oxygen!
• This pathway toRespiration
Anaerobic
produce energy this
way is called
fermentation a
process which occurs in
cytoplasm and produces
small amounts of ATP
without the presence of
oxygen
• Alcohol
fermentation
occurs in yeast &
some bacteria,
pyruvate
converted to
ethyl alcohol &
carbon dioxide
Photosynthesis & Cellular Respiration
• The products for photosynthesis are the reactants
for cellular respiration and the products for cellular
respiration are the reactants for photosynthesis, thus
this is a continuous cycle.