Cellular Respiration
What we do with our energy
Root Words
Mito
Cyto
Di
Aero
Ana
Thread
Cell
Two
Air
Back
Mitochondria
Cytoplasm
Dioxide
Aerobic
Anaerobic
Anaerobic


vs. aerobic
Uses no oxygen
Makes a little energy


Uses oxygen
Makes a lot of energy
Overview Of Cellular Respiration

Cellular respiration is the
process that releases energy by
breaking down glucose and
other molecules in the presence
of oxygen.

Mitochondria (mainly)
Purpose of cellular respiration?
 To
release energy from food molecules and
make ATP!
 Why do we need ATP?

To run chemical reactions that keep us alive and
functioning.
Summary equation for Respiration
The pathways
Stage 1- Glycolysis
(Anaerobic)

Glycolysis- Breakdown of glucose in the
cytoplasm


Breaks glucose into 2 pyruvate
Pyruvate enters into Kreb’s Cycle

Glycolysis uses 2ATP
but produces 4ATP,
so there is a net gain
of 2 molecules
Cooking food Requires Energy
Anaerobic respiration



Not enough oxygen for aerobic respiration
Fermentation-releases energy from food
by producing ATP in the absence of
oxygen. (Anaerobic = no oxygen)
Two types: alcoholic fermentation,
lactic acid fermentation
Lactic acid





No oxygen
Occurs in muscles
Occurs so muscles can
continue making ATP
Get lactate build up in
muscles
Causes soreness
Alcoholic



No oxygen
Seen in yeast and
fungus
Used to make
beverages, food, makes
dough rise
Stage 2: Krebs Cycle

Krebs cycle (aerobic)



Takes place in mitochondria
Pyruvate is broken down into carbon dioxide for
energy
Creates more ATP than Glycolysis
Overall



Cellular Respiration breaks down C6H12O6.
It produces H2O and CO2
It produces 36 ATPs!
Comparing Photosynthesis &
Cellular Respiration
Photosynthesis
Cellular Respiration
Function
Energy capture
Energy Release
Location
Chloroplasts
Mitochondria
Reactants
CO2 & H2O
C6H12O6 & O2
Products
C6H12O6 & O2
CO2 & H2O
Equation
6CO2 + 6H2O ->
C6H12O6 + 6O2
C6H12O6 + 6O2 > >
> 6CO2 + 6H2O