Cellular respiration is the process cells use to release energy from glucose and store it in ATP. It occurs in three stages: 1. Glycolysis breaks glucose into two pyruvate molecules, releasing a small amount of energy as ATP. 2. The citric acid cycle in the mitochondria further breaks down the pyruvate molecules, producing more ATP and electron carriers. 3. The electron transport chain uses oxygen to pump protons out of the mitochondria, powering ATP synthase to produce most of the cell's ATP through oxidative phosphorylation. Aerobic respiration produces 36 ATP while fermentation makes only 2 ATP without oxygen.

1. Cellular
Respiration
Introduction and Overview
She’s
getting
energy
from her
food!

2. As always…
Key concepts are underlined
Vocabulary terms are in green

3. In this lesson you will learn to:
1. Write the equation for
respiration in symbols and
words
2. Identify the stages of aerobic
cellular respiration and the
reactants and products for
each stage

4. On your whiteboards
What are
some things
you feel
when you
have not
eaten in a
long time?

5. Energy for CellsEnergy for Cells
We get energyWe get energy
from our foodfrom our food
One gram ofOne gram of
glucose releasesglucose releases
3811 calories of3811 calories of
energyenergy

6. Draw
this

7. To make ATP we need 2*
things
1. Glucose – from food
2. Oxygen*
1. Organisms can make a little ATP without O2
https://www.youtube.com/watch?v=x8oLu7znwQ0

8. ● Cellular Respiration = process that
cells use to release the energy from
glucose and store it in molecules of
ATP

9. On your whiteboards
What is the chemical symbol for:
Oxygen
Water
Carbon dioxide
Glucose

10. Respiration Equation:
What are the reactants in this equation?
What are the products in this equation?
We need lots
of ATP to
run this fast!

11. Taller partner: How are
the equations for
photosynthesis and
cellular respiration
related to each other?
Shorter partner:
How are they similar?
How are they different?

14. Autotroph or Heterotroph?

15. C6H12O6
ATP
Light energy
Chemical (food)
energy
Chemical
energy

16. Breaking chemical bonds in sugarBreaking chemical bonds in sugar
releases energyreleases energy
That energy isThat energy is stored instored in molecules ofmolecules of
ATPATP

17. On your whiteboards
What is RELEASED
when chemical bonds are
broken?
So…what is STORED in
chemical bonds?

18. There are 3 stages to aerobic
cellular respiration

19. How Cells Make ATP
Glucose
Glycolysis
O2 Present O2 Absent
Broken glucose goes to mitochondria
Mitochondria makes lots of ATP
Fermentation
Alcohol Lactic
Acid

20. How do cells get the energy out
of glucose? – Stage 1 GlycolysisGlycolysis
Cells take in glucose
and break it in half -
this is glycolysis
This releases some
energy
2 ATP are made
energy!

21. If no OIf no O22  anaerobic respirationanaerobic respiration
Only 2 ATP made
This process is also called
fermentation

22. 2 Types of Fermentation
Alcohol
Fermentation
Yeast and
bacteria do this
Produces alcohol
as a by product

23. Lactic Acid Fermentation
 Occurs in muscle cells, yeast, bacteria
 Produces lactic acid – yogurt, cheese, burning
pain in muscles

24. Partner and Class Discussion
Do all living things require oxygen?
How is it that some organisms, like
bacteria and yeast, can survive only
making 2 ATP for each sugar molecule
they consume?

25. If O2 is available  aerobic respiration!aerobic respiration!
Sugar molecules
sent to
mitochondria 
36 ATP made
36 ATP!

26. 2 ATP
36 ATP!

27. Stage 2  Citric Acid
Cycle (aka Kreb's
cycle)
 happens in the
matrix
 Reactant: ½
sugar
 Products: 2
ATP, CO2,
electron carrier
NADH

28. Mitochondria
 Electron
Transport
Chain
 happens on
the cristae
 Reactants: O2,
NADH
 Products:
H2O, 34-36
ATP

29. Comparing Photosynthesis andComparing Photosynthesis and
Cellular RespirationCellular Respiration
Photosynthesis vs. Cellular RespirationPhotosynthesis vs. Cellular Respiration
PhotosynthesisPhotosynthesis Cellular RespirationCellular Respiration
FunctionFunction Energy storage byEnergy storage by
making glucosemaking glucose
Energy release byEnergy release by
breaking downbreaking down
glucoseglucose
LocationLocation ChloroplastsChloroplasts MitochondriaMitochondria
ReactantsReactants COCO22 and Hand H22OO CC66HH1212OO66 and Oand O22
ProductsProducts CC66HH1212OO66 and Oand O22 COCO22 and Hand H22OO
EquationEquation COCO22 + H+ H220 C0 C66HH1212OO66 + O+ O22
OO22 + C+ C66HH1212OO66 COCO22 + H+ H22OO

30. So can you…
1. Write the equation for
respiration in symbols and
words?
2. Name the 3 stages of aerobic
cellular respiration and the
reactants and products for
each stage?