Cells and Energy –
Cellular Respiration
Cellular Respiration Equation
C6H12O6 + 6O2  6CO2 + 6H2O + cell
energy (ATP)
In words…..
Glucose + oxygen  carbon dioxide
+ water + energy
Cellular Respiration Occurs In All Cells
1. The process called cellular respiration
releases the energy in carbohydrates in two
steps.
2. Then cells use the energy for life activities
3. All Cells perform cellular respiration to get
energy
4. During cellular respiration, mitochondria
make many ATP molecules
Step 1: Glycolysis
glyco – sugar
lysis – to break down
5. Glycolysis is the name of a chemical
reaction.
6. Glycolysis occurs in the cell’s cytoplasm.
7. One glucose molecule breaks into two
smaller molecules called pyruvate and also
makes two ATP molecules
Step 2a: Krebs Cycle
8. Oxidative Respiration
(Krebs Cycle) occurs
only in the presence of
oxygen
9. Occurs in the
mitochondria if oxygen
is present
10. Uses oxygen,
pyruvate, and other
substances to produce
34 ATP molecules!!
Lots of energy!
Oxidative
Respiration
Oxidative
respiration
makes 34 ATP
molecules
Occurs In the
Mitochondria;
Known as the
Krebs Cycle
Step 2b: Fermentation
Fermentation occurs in the absence
of oxygen
2. 2. In grapes it produces alcohol
3. 3. In muscle cells it produces
lactic acid which makes muscles
sore.
1.
Lactic acid Fermentationoccurs in your muscles when
there is no oxygen available
in your muscle cells
Alcohol Fermentationalso makes the alcohol
in wine from grapes
#82
Purpose
Cellular Respiration
To break down glucose into
usable energy (ATP)
Where Reaction
occurs
Cytoplasm & Mitochondria
Present in…
Plants and Animals
Raw Materials
Oxygen, glucose
Products
Carbon dioxide & water and energy
Formula
C6H12O6 + 6O2  6CO2 + 6H2O + cell energy
Reactants
products